Hello,
syzbot found the following issue on:
HEAD commit: 1c925d20 Add linux-next specific files for 20210108
git tree: linux-next
console output:
https://syzkaller.appspot.com/x/log.txt?x=102c64f7500000
kernel config:
https://syzkaller.appspot.com/x/.config?x=95c0f8926d38eed7
dashboard link:
https://syzkaller.appspot.com/bug?extid=a25e6c9d269af5435955
compiler: gcc (GCC) 10.1.0-syz 20200507
CC: [
linux-...@vger.kernel.org linux-...@vger.kernel.org vi...@zeniv.linux.org.uk]
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+a25e6c...@syzkaller.appspotmail.com
INFO: task syz-executor.0:12329 can't die for more than 143 seconds.
task:syz-executor.0 state:R running task stack:27248 pid:12329 ppid: 8490 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:4312 [inline]
__schedule+0x90c/0x21a0 kernel/sched/core.c:5063
preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:5223
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:40
__raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:183
spin_unlock include/linux/spinlock.h:394 [inline]
ilookup5_nowait fs/inode.c:1336 [inline]
ilookup5 fs/inode.c:1364 [inline]
iget5_locked+0xcc/0x2d0 fs/inode.c:1145
fuse_iget+0x24e/0x610 fs/fuse/inode.c:356
fuse_lookup_name+0x447/0x630 fs/fuse/dir.c:439
fuse_lookup.part.0+0xdf/0x390 fs/fuse/dir.c:469
fuse_lookup+0x70/0x90 fs/fuse/dir.c:465
__lookup_slow+0x24c/0x480 fs/namei.c:1549
lookup_slow fs/namei.c:1566 [inline]
walk_component+0x418/0x6a0 fs/namei.c:1861
lookup_last fs/namei.c:2316 [inline]
path_lookupat+0x1ba/0x830 fs/namei.c:2340
filename_lookup+0x19f/0x560 fs/namei.c:2373
user_path_at include/linux/namei.h:60 [inline]
do_fchmodat+0x92/0x140 fs/open.c:619
__do_sys_fchmodat fs/open.c:634 [inline]
__se_sys_fchmodat fs/open.c:631 [inline]
__x64_sys_fchmodat+0x72/0xb0 fs/open.c:631
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
RSP: 002b:00007f4878bdec68 EFLAGS: 00000246 ORIG_RAX: 000000000000010c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 000000000119c068 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007ffe5d6d3a6f R14: 00007f4878bdf9c0 R15: 000000000119c034
INFO: task syz-executor.0:12352 can't die for more than 143 seconds.
task:syz-executor.0 state:D stack:27152 pid:12352 ppid: 8490 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4312 [inline]
__schedule+0x90c/0x21a0 kernel/sched/core.c:5063
schedule+0xcf/0x270 kernel/sched/core.c:5142
rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106
__down_write_common kernel/locking/rwsem.c:1261 [inline]
__down_write_common kernel/locking/rwsem.c:1258 [inline]
__down_write kernel/locking/rwsem.c:1270 [inline]
down_write+0x132/0x150 kernel/locking/rwsem.c:1407
inode_lock include/linux/fs.h:773 [inline]
lock_mount+0x8a/0x2e0 fs/namespace.c:2204
do_new_mount_fc fs/namespace.c:2832 [inline]
do_new_mount fs/namespace.c:2891 [inline]
path_mount+0x1678/0x1e70 fs/namespace.c:3220
do_mount fs/namespace.c:3233 [inline]
__do_sys_mount fs/namespace.c:3441 [inline]
__se_sys_mount fs/namespace.c:3418 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3418
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
RSP: 002b:00007f4878bbdc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219
RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000
RBP: 000000000119c120 R08: 0000000020002140 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc
R13: 00007ffe5d6d3a6f R14: 00007f4878bbe9c0 R15: 000000000119c0dc
INFO: task syz-executor.0:12352 blocked for more than 144 seconds.
Not tainted 5.11.0-rc2-next-20210108-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:27152 pid:12352 ppid: 8490 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4312 [inline]
__schedule+0x90c/0x21a0 kernel/sched/core.c:5063
schedule+0xcf/0x270 kernel/sched/core.c:5142
rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106
__down_write_common kernel/locking/rwsem.c:1261 [inline]
__down_write_common kernel/locking/rwsem.c:1258 [inline]
__down_write kernel/locking/rwsem.c:1270 [inline]
down_write+0x132/0x150 kernel/locking/rwsem.c:1407
inode_lock include/linux/fs.h:773 [inline]
lock_mount+0x8a/0x2e0 fs/namespace.c:2204
do_new_mount_fc fs/namespace.c:2832 [inline]
do_new_mount fs/namespace.c:2891 [inline]
path_mount+0x1678/0x1e70 fs/namespace.c:3220
do_mount fs/namespace.c:3233 [inline]
__do_sys_mount fs/namespace.c:3441 [inline]
__se_sys_mount fs/namespace.c:3418 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3418
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
RSP: 002b:00007f4878bbdc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219
RDX: 0000000020002100 RSI: 00000000200042c0 RDI: 0000000000000000
RBP: 000000000119c120 R08: 0000000020002140 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc
R13: 00007ffe5d6d3a6f R14: 00007f4878bbe9c0 R15: 000000000119c0dc
Showing all locks held in the system:
1 lock held by khungtaskd/1664:
#0: ffffffff8b373fe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254
1 lock held by in:imklog/8176:
#0: ffff888017e13270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947
2 locks held by kworker/u4:6/9976:
#0: ffff8880b9f34fd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1319 [inline]
#0: ffff8880b9f34fd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x217/0x21a0 kernel/sched/core.c:4980
#1: ffff8880b9f20088 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833
2 locks held by syz-executor.0/12329:
1 lock held by syz-executor.0/12352:
#0: ffff888077f80150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline]
#0: ffff888077f80150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2204
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1664 Comm: khungtaskd Not tainted 5.11.0-rc2-next-20210108-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline]
watchdog+0xd89/0xf30 kernel/hung_task.c:338
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 12329 Comm: syz-executor.0 Not tainted 5.11.0-rc2-next-20210108-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:90 [inline]
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:82 [inline]
RIP: 0010:lock_release+0x139/0x710 kernel/locking/lockdep.c:5450
Code: 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 48 05 00 00 <45> 8b 8e 8c 09 00 00 45 85 c9 0f 85 8c 02 00 00 9c 8f 04 24 fa 48
RSP: 0018:ffffc90016d4f568 EFLAGS: 00000246
RAX: 0000000000000007 RBX: ffffffff8d04199c RCX: 1ffffffff1a08333
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88801de8098c
RBP: 1ffff92002da9eaf R08: 0000000000000000 R09: ffffffff8d03e7cf
R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8b0146d8
R13: ffffffff82a28d10 R14: ffff88801de80000 R15: dffffc0000000000
FS: 00007f4878bdf700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2e53c26010 CR3: 0000000026638000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline]
_raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:183
spin_unlock include/linux/spinlock.h:394 [inline]
ilookup5_nowait fs/inode.c:1336 [inline]
ilookup5 fs/inode.c:1364 [inline]
iget5_locked+0xcc/0x2d0 fs/inode.c:1145
fuse_iget+0x271/0x610 fs/fuse/inode.c:342
fuse_lookup_name+0x447/0x630 fs/fuse/dir.c:439
fuse_lookup.part.0+0xdf/0x390 fs/fuse/dir.c:469
fuse_lookup+0x70/0x90 fs/fuse/dir.c:465
__lookup_slow+0x24c/0x480 fs/namei.c:1549
lookup_slow fs/namei.c:1566 [inline]
walk_component+0x418/0x6a0 fs/namei.c:1861
lookup_last fs/namei.c:2316 [inline]
path_lookupat+0x1ba/0x830 fs/namei.c:2340
filename_lookup+0x19f/0x560 fs/namei.c:2373
user_path_at include/linux/namei.h:60 [inline]
do_fchmodat+0x92/0x140 fs/open.c:619
__do_sys_fchmodat fs/open.c:634 [inline]
__se_sys_fchmodat fs/open.c:631 [inline]
__x64_sys_fchmodat+0x72/0xb0 fs/open.c:631
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4878bdec68 EFLAGS: 00000246 ORIG_RAX: 000000000000010c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 000000000119c068 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007ffe5d6d3a6f R14: 00007f4878bdf9c0 R15: 000000000119c034
---
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