INFO: task hung in lock_mount

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syzbot

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Apr 11, 2019, 4:44:44 AM4/11/19
to syzkaller-a...@googlegroups.com
Hello,

syzbot found the following crash on:

HEAD commit: a4230bea Merge 4.9.109 into android-4.9
git tree: android-4.9
console output: https://syzkaller.appspot.com/x/log.txt?x=176e28c0400000
kernel config: https://syzkaller.appspot.com/x/.config?x=12491c13dbc6d8
dashboard link: https://syzkaller.appspot.com/bug?extid=146d2f3d94cbaa8b0c9d
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=106c9720400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=123cdbd8400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+146d2f...@syzkaller.appspotmail.com

INFO: task syz-executor958:4365 blocked for more than 120 seconds.
Not tainted 4.9.109-ga4230be #48
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor958 D28456 4365 4246 0x00000000
ffff8801ce26c800 ffff8801cec0f480 ffff8801cec0f480 ffff8801d32e3000
ffff8801db321c18 ffff8801cbb1fa38 ffffffff839e8a8d ffffffff812355f7
0000000000000000 ffff8801ce26d0c0 0000000600000007 ffff8801db3224e8
Call Trace:
[<ffffffff839ea08f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
[<ffffffff839f56c8>] __rwsem_down_write_failed_common
kernel/locking/rwsem-xadd.c:526 [inline]
[<ffffffff839f56c8>] rwsem_down_write_failed+0x598/0x990
kernel/locking/rwsem-xadd.c:555
[<ffffffff81ee8107>] call_rwsem_down_write_failed+0x17/0x30
arch/x86/lib/rwsem.S:105
[<ffffffff839f349c>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
[<ffffffff839f349c>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
[<ffffffff815e16fc>] inode_lock include/linux/fs.h:766 [inline]
[<ffffffff815e16fc>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
[<ffffffff815e44c7>] do_add_mount+0x27/0x340 fs/namespace.c:2460
[<ffffffff815e61b2>] do_new_mount fs/namespace.c:2527 [inline]
[<ffffffff815e61b2>] do_mount+0x1332/0x2740 fs/namespace.c:2835
[<ffffffff815e7f9e>] SYSC_mount fs/namespace.c:3051 [inline]
[<ffffffff815e7f9e>] SyS_mount+0xfe/0x110 fs/namespace.c:3028
[<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
[<ffffffff839f9993>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/519:
#0: (rcu_read_lock){......}, at: [<ffffffff8136662c>]
check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
#0: (rcu_read_lock){......}, at: [<ffffffff8136662c>]
watchdog+0x11c/0xa20 kernel/hung_task.c:239
#1: (tasklist_lock){.+.+..}, at: [<ffffffff81425cb7>]
debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3775:
#0: (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7b32>]
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
#1: (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211fce2>]
n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor958/4262:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4270:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4277:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4284:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4292:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4298:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4303:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4316:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4319:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4329:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4330:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4340:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4352:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4353:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4365:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
2 locks held by syz-executor958/4366:
#0: (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write
include/linux/fs.h:1573 [inline]
#0: (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>]
mnt_want_write+0x3f/0xb0 fs/namespace.c:391
#1: (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>]
inode_lock_nested include/linux/fs.h:801 [inline]
#1: (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>]
lock_rename+0x236/0x290 fs/namei.c:2857
2 locks held by syz-executor958/4261:
#0: (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write
include/linux/fs.h:1573 [inline]
#0: (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>]
mnt_want_write+0x3f/0xb0 fs/namespace.c:391
#1: (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff815a9eca>]
inode_lock_nested include/linux/fs.h:801 [inline]
#1: (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff815a9eca>]
filename_create+0x17a/0x490 fs/namei.c:3639
1 lock held by syz-executor958/4265:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4273:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4279:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4287:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4308:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4309:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4320:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4321:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>]
inode_lock_shared include/linux/fs.h:776 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>]
lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor958/4335:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4342:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4343:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4356:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4357:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4370:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>]
inode_lock_shared include/linux/fs.h:776 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>]
lookup_slow+0x141/0x470 fs/namei.c:1645
2 locks held by syz-executor958/4371:
#0: (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write
include/linux/fs.h:1573 [inline]
#0: (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>]
mnt_want_write+0x3f/0xb0 fs/namespace.c:391
#1: (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff815a9eca>]
inode_lock_nested include/linux/fs.h:801 [inline]
#1: (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff815a9eca>]
filename_create+0x17a/0x490 fs/namei.c:3639
2 locks held by syz-executor958/4260:
#0: (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write
include/linux/fs.h:1573 [inline]
#0: (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>]
mnt_want_write+0x3f/0xb0 fs/namespace.c:391
#1: (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>]
inode_lock_nested include/linux/fs.h:801 [inline]
#1: (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>]
lock_rename+0x236/0x290 fs/namei.c:2857
1 lock held by syz-executor958/4269:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4276:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4283:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4291:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4300:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4306:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4307:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4313:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4327:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4328:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4350:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4351:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4369:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4378:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4382:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4259:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4268:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4274:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4282:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4290:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4296:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4301:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
2 locks held by syz-executor958/4312:
#0: (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write
include/linux/fs.h:1573 [inline]
#0: (sb_writers#8){.+.+.+}, at: [<ffffffff815e08df>]
mnt_want_write+0x3f/0xb0 fs/namespace.c:391
#1: (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>]
inode_lock_nested include/linux/fs.h:801 [inline]
#1: (&sb->s_type->i_mutex_key#13/1){+.+.+.}, at: [<ffffffff81593fa6>]
lock_rename+0x236/0x290 fs/namei.c:2857
1 lock held by syz-executor958/4326:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4336:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4345:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4346:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4360:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4374:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4375:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4381:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4258:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4267:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4275:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4281:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4289:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4297:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4302:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4314:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4315:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4331:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4332:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4344:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4358:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4359:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4372:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4373:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4256:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4263:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4271:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4285:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4293:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4299:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4304:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4317:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4325:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4338:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4339:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4349:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4363:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4364:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4379:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4380:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>]
inode_lock_shared include/linux/fs.h:776 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>]
lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor958/4255:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4266:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4280:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4288:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>]
inode_lock_shared include/linux/fs.h:776 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>]
lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor958/4295:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4310:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4311:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4323:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4324:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4337:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4347:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4348:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4361:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4362:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4376:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4377:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4257:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4264:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4272:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4278:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4286:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4294:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4305:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4318:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4322:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>]
inode_lock_shared include/linux/fs.h:776 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff81594b61>]
lookup_slow+0x141/0x470 fs/namei.c:1645
1 lock held by syz-executor958/4333:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4334:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4341:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4354:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4355:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4367:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077
1 lock held by syz-executor958/4368:
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
inode_lock include/linux/fs.h:766 [inline]
#0: (&sb->s_type->i_mutex_key#13){++++++}, at: [<ffffffff815e16fc>]
lock_mount+0x8c/0x2c0 fs/namespace.c:2077

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.109-ga4230be #48
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
ffff8801d891fd08 ffffffff81eb3e29 0000000000000000 0000000000000000
0000000000000000 0000000000000001 ffffffff810b9580 ffff8801d891fd40
ffffffff81ebf127 0000000000000000 0000000000000000 0000000000000003
Call Trace:
[<ffffffff81eb3e29>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81eb3e29>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
[<ffffffff81ebf127>] nmi_cpu_backtrace.cold.2+0x48/0x87
lib/nmi_backtrace.c:99
[<ffffffff81ebf0ba>] nmi_trigger_cpumask_backtrace+0x12a/0x14f
lib/nmi_backtrace.c:60
[<ffffffff810b9684>] arch_trigger_cpumask_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:37
[<ffffffff81366bc4>] trigger_all_cpu_backtrace include/linux/nmi.h:58
[inline]
[<ffffffff81366bc4>] check_hung_task kernel/hung_task.c:125 [inline]
[<ffffffff81366bc4>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<ffffffff81366bc4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
[<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
[<ffffffff839f9b5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4254 Comm: syz-executor958 Not tainted 4.9.109-ga4230be #48
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff8801cfc50000 task.stack: ffff8801be940000
RIP: 0010:[<ffffffff8158d462>] c [<ffffffff8158d462>]
pipe_write+0x612/0xd60 fs/pipe.c:386
RSP: 0018:ffff8801be947c00 EFLAGS: 00000a06
RAX: dffffc0000000000 RBX: ffff8801cfd70280 RCX: 1ffffffff0798d78
RDX: 0000000000000000 RSI: ffffffff8158d386 RDI: ffff8801d07ddf90
RBP: ffff8801be947c78 R08: ffff8801cfc508e8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000012
R13: 0000000000000001 R14: ffffffff83cc6bc0 R15: ffff8801d07ddf80
FS: 0000000001939880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8798dae110 CR3: 00000001d4e37000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
eff1a6c41b3a044f c ffff8801be947d80 c 0000000000000012 c ffff8801cfd70354 c
0000000000000001 c ffff8801be947d70 c ffff8801be947c70 c ffff8801cfd70348 c
ffffffff81ef267f c ffff8801cfc2c000 c 1ffff10037d28f96 c ffff8801be947dd0 c
Call Trace:
[<ffffffff8156eb60>] new_sync_write fs/read_write.c:496 [inline]
[<ffffffff8156eb60>] __vfs_write+0x3e0/0x580 fs/read_write.c:509
[<ffffffff81572957>] vfs_write+0x187/0x530 fs/read_write.c:557
[<ffffffff81576789>] SYSC_write fs/read_write.c:604 [inline]
[<ffffffff81576789>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
[<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
[<ffffffff839f9993>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: c10 c48 c89 cfa c48 cc1 cea c03 c80 c3c c02 c00 c0f c85
cd4 c06 c00 c00 c48 cba c00 c00 c00 c00 c00 cfc cff cdf c4d
c8b c77 c10 c4c c89 cf1 c48 cc1 ce9 c03 c0f cb6 c14 c11
c<84> cd2 c74 c09 c80 cfa c03 c0f c8e ce0 c06 c00 c00 c41
c8b c36 c85 cf6 c0f c84 c12 c


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

syzbot

unread,
Apr 12, 2019, 8:00:54 PM4/12/19
to syzkaller-a...@googlegroups.com
Hello,

syzbot found the following crash on:

HEAD commit: 07c01385 Merge 4.4.138 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=15dcdbd8400000
kernel config: https://syzkaller.appspot.com/x/.config?x=9015d1e2403e29b6
dashboard link: https://syzkaller.appspot.com/bug?extid=62e8620e2a34781b89d5
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16ac9720400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14df1930400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+62e862...@syzkaller.appspotmail.com

INFO: task syz-executor007:3907 blocked for more than 120 seconds.
Not tainted 4.4.138-g07c0138 #62
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor007 D ffff8801c670fbb8 28144 3907 3904 0x00000000
ffff8801c670fbb8 0000000000000000 ffff8801d87d68e0 ffffed003b0fad1b
ffff8801d87d6000 ffff8801db21fdb8 ffff8801db21fde0 ffff8801db21f4d8
ffff8801db21f4c0 ffff8801d7d29800 ffff8801d87d6000 0000000000000000
Call Trace:
[<ffffffff838b46ea>] schedule+0x7a/0x1b0 kernel/sched/core.c:3359
[<ffffffff838b4e83>] schedule_preempt_disabled+0x13/0x20
kernel/sched/core.c:3392
[<ffffffff838bafc7>] __mutex_lock_common kernel/locking/mutex.c:582
[inline]
[<ffffffff838bafc7>] mutex_lock_nested+0x307/0x850
kernel/locking/mutex.c:621
[<ffffffff8158477e>] lock_mount+0x8e/0x2c0 fs/namespace.c:2054
[<ffffffff8158856d>] do_loopback fs/namespace.c:2187 [inline]
[<ffffffff8158856d>] do_mount+0x96d/0x2860 fs/namespace.c:2827
[<ffffffff8158ae70>] SYSC_mount fs/namespace.c:3027 [inline]
[<ffffffff8158ae70>] SyS_mount+0x130/0x1d0 fs/namespace.c:3005
[<ffffffff838c2725>] entry_SYSCALL_64_fastpath+0x22/0x9e
1 lock held by syz-executor007/3907:
#0: (&sb->s_type->i_mutex_key#13){+.+.+.}, at: [<ffffffff8158477e>]
lock_mount+0x8e/0x2c0 fs/namespace.c:2054
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 3919 Comm: syz-executor007 Not tainted 4.4.138-g07c0138 #62
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff8800ace21800 task.stack: ffff8801d7150000
RIP: 0010:[<ffffffff815b29d2>] [<ffffffff815b29d2>] do_make_slave
fs/pnode.c:83 [inline]
RIP: 0010:[<ffffffff815b29d2>] [<ffffffff815b29d2>]
change_mnt_propagation+0xe2/0xb70 fs/pnode.c:130
RSP: 0018:ffff8801d7157b08 EFLAGS: 00000246
RAX: 1ffff10016bfc416 RBX: ffff8801d80e8400 RCX: ffff8801d80e8468
RDX: 0000000000000000 RSI: ffffffff815b29b0 RDI: ffff8800b5fe20b0
RBP: ffff8801d7157b60 R08: ffff8801d80e8468 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8800ace21800 R12: ffff8800b5fe2000
R13: 0000000000040000 R14: dffffc0000000000 R15: ffff8800b5fe22b0
FS: 00007f1dc2ab7700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f024a5a2000 CR3: 00000001d011e000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
ffffffff8157e63d ffff8801d80e8400 0000000000000000 ffff8801d80e8420
ffff8801d80e84e0 ffffed003b01d084 ffff8801d80e8490 dffffc0000000000
ffff8801d80e8400 ffff8801c7b45e40 ffff8801d7157c00 ffff8801d7157c28
Call Trace:
[<ffffffff8157ed56>] umount_tree+0x326/0x810 fs/namespace.c:1501
[<ffffffff8158714c>] attach_recursive_mnt+0x74c/0x8e0 fs/namespace.c:2035
[<ffffffff8158744f>] graft_tree+0x16f/0x1f0 fs/namespace.c:2099
[<ffffffff81589ce8>] do_loopback fs/namespace.c:2220 [inline]
[<ffffffff81589ce8>] do_mount+0x20e8/0x2860 fs/namespace.c:2827
[<ffffffff8158ae70>] SYSC_mount fs/namespace.c:3027 [inline]
[<ffffffff8158ae70>] SyS_mount+0x130/0x1d0 fs/namespace.c:3005
[<ffffffff838c2725>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: 13 02 00 00 e8 00 eb d9 ff 49 8d bc 24 b0 00 00 00 48 89 f8 48 c1 e8
03 42 80 3c 30 00 0f 85 41 08 00 00 4d 8b bc 24 b0 00 00 00 <49> 8d 97 50
ff ff ff 48 39 d3 49 89 d4 75 90 48 89 55 d0 e8 c6
NMI backtrace for cpu 1
CPU: 1 PID: 491 Comm: khungtaskd Not tainted 4.4.138-g07c0138 #62
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff8800bac59800 task.stack: ffff8800bb3a0000
RIP: 0010:[<ffffffff810bfb26>] [<ffffffff810bfb26>] native_apic_mem_write
arch/x86/include/asm/apic.h:94 [inline]
RIP: 0010:[<ffffffff810bfb26>] [<ffffffff810bfb26>]
__default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline]
RIP: 0010:[<ffffffff810bfb26>] [<ffffffff810bfb26>] _flat_send_IPI_mask
arch/x86/kernel/apic/apic_flat_64.c:61 [inline]
RIP: 0010:[<ffffffff810bfb26>] [<ffffffff810bfb26>]
flat_send_IPI_mask+0xf6/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8800bb3a7cc8 EFLAGS: 00000046
RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300
RBP: ffff8800bb3a7cf0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000003 R14: 0000000000000002 R15: ffffffff8446f6a0
FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000903b10 CR3: 00000001d02ed000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
ffffffff8446f6a0 ffffffff84a18ee0 0000000000000007 fffffbfff0942c8c
0000000000000040 ffff8800bb3a7d10 ffffffff810b5ae1 ffffffff83c0b460
0000000000000003 ffff8800bb3a7d68 ffffffff81e19d83 ffffffff8140dd6f
Call Trace:
[<ffffffff810b5ae1>] nmi_raise_cpu_backtrace+0x61/0x80
arch/x86/kernel/apic/hw_nmi.c:33
[<ffffffff81e19d83>] nmi_trigger_all_cpu_backtrace.cold.4+0x70/0xad
lib/nmi_backtrace.c:85
[<ffffffff810b5b84>] arch_trigger_all_cpu_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:38
[<ffffffff8141a459>] trigger_all_cpu_backtrace include/linux/nmi.h:44
[inline]
[<ffffffff8141a459>] check_hung_task kernel/hung_task.c:125 [inline]
[<ffffffff8141a459>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<ffffffff8141a459>] watchdog.cold.1+0xd3/0xee kernel/hung_task.c:238
[<ffffffff81190958>] kthread+0x268/0x300 kernel/kthread.c:211
[<ffffffff838c2b55>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510
Code: b3 5f ff f6 c4 10 75 e2 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89
f2 09 da 80 cf 04 41 83 fe 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00
02 00 00 75 1a 4c 89 e7 57 9d 0f 1f 44 00 00 e8 02
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