[syzbot] [ntfs3?] INFO: task hung in ni_readpage_cmpr

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 7c2878be5732 Add linux-next specific files for 20230714
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13820f32a80000
kernel config: https://syzkaller.appspot.com/x/.config?x=3baff2936ac3cefa
dashboard link: https://syzkaller.appspot.com/bug?extid=9877b6999a2554291c7d
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=119010f4a80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=170ad732a80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bfdfa043f096/disk-7c2878be.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cf7a97f69e2a/vmlinux-7c2878be.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8366b63af2c6/bzImage-7c2878be.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/d3f8a02941e7/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9877b6...@syzkaller.appspotmail.com

INFO: task syz-executor122:5344 blocked for more than 143 seconds.
Not tainted 6.5.0-rc1-next-20230714-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor122 state:D stack:26032 pid:5344 ppid:5028 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0xee1/0x59f0 kernel/sched/core.c:6709
schedule+0xe7/0x1b0 kernel/sched/core.c:6785
io_schedule+0xbe/0x130 kernel/sched/core.c:9027
folio_wait_bit_common+0x3d0/0x9a0 mm/filemap.c:1304
__folio_lock mm/filemap.c:1632 [inline]
folio_lock include/linux/pagemap.h:974 [inline]
folio_lock include/linux/pagemap.h:970 [inline]
__filemap_get_folio+0x788/0x990 mm/filemap.c:1900
pagecache_get_page+0x2c/0x270 mm/folio-compat.c:99
find_or_create_page include/linux/pagemap.h:655 [inline]
ni_readpage_cmpr+0x24e/0xc80 fs/ntfs3/frecord.c:2135
ntfs_read_folio+0x107/0x1e0 fs/ntfs3/inode.c:718
filemap_read_folio+0xe5/0x2b0 mm/filemap.c:2390
filemap_create_folio mm/filemap.c:2518 [inline]
filemap_get_pages+0xdd7/0x1820 mm/filemap.c:2571
filemap_splice_read+0x3d0/0x9f0 mm/filemap.c:2927
ntfs_file_splice_read+0x10d/0x190 fs/ntfs3/file.c:773
vfs_splice_read fs/splice.c:993 [inline]
vfs_splice_read+0x2c8/0x3b0 fs/splice.c:962
splice_direct_to_actor+0x2a5/0xa30 fs/splice.c:1069
do_splice_direct+0x1af/0x280 fs/splice.c:1194
do_sendfile+0xb88/0x1390 fs/read_write.c:1254
__do_sys_sendfile64 fs/read_write.c:1322 [inline]
__se_sys_sendfile64 fs/read_write.c:1308 [inline]
__x64_sys_sendfile64+0x1d6/0x220 fs/read_write.c:1308
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd9aca10e09
RSP: 002b:00007fd9ac9c5168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd9acab1708 RCX: 00007fd9aca10e09
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007fd9acab1700 R08: 00007fd9ac9c56c0 R09: 0000000000000000
R10: 0001000000201005 R11: 0000000000000246 R12: 00007fd9acab170c
R13: 0000000000000006 R14: 00007ffdd97961a0 R15: 00007ffdd9796288
</TASK>
INFO: task syz-executor122:5345 blocked for more than 143 seconds.
Not tainted 6.5.0-rc1-next-20230714-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor122 state:D stack:26448 pid:5345 ppid:5028 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0xee1/0x59f0 kernel/sched/core.c:6709
schedule+0xe7/0x1b0 kernel/sched/core.c:6785
io_schedule+0xbe/0x130 kernel/sched/core.c:9027
folio_wait_bit_common+0x3d0/0x9a0 mm/filemap.c:1304
__folio_lock mm/filemap.c:1632 [inline]
folio_lock include/linux/pagemap.h:974 [inline]
folio_lock include/linux/pagemap.h:970 [inline]
__filemap_get_folio+0x788/0x990 mm/filemap.c:1900
pagecache_get_page+0x2c/0x270 mm/folio-compat.c:99
find_or_create_page include/linux/pagemap.h:655 [inline]
ntfs_get_frame_pages+0x132/0x640 fs/ntfs3/file.c:793
ntfs_compress_write fs/ntfs3/file.c:943 [inline]
ntfs_file_write_iter+0xfdc/0x1c10 fs/ntfs3/file.c:1080
call_write_iter include/linux/fs.h:1916 [inline]
do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735
do_iter_write+0x17f/0x830 fs/read_write.c:860
vfs_iter_write+0x7a/0xb0 fs/read_write.c:901
iter_file_splice_write+0x698/0xbf0 fs/splice.c:738
do_splice_from fs/splice.c:933 [inline]
direct_splice_actor+0x118/0x180 fs/splice.c:1142
splice_direct_to_actor+0x347/0xa30 fs/splice.c:1088
do_splice_direct+0x1af/0x280 fs/splice.c:1194
do_sendfile+0xb88/0x1390 fs/read_write.c:1254
__do_sys_sendfile64 fs/read_write.c:1322 [inline]
__se_sys_sendfile64 fs/read_write.c:1308 [inline]
__x64_sys_sendfile64+0x1d6/0x220 fs/read_write.c:1308
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd9aca10e09
RSP: 002b:00007fd9a47a4168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd9acab1718 RCX: 00007fd9aca10e09
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00007fd9acab1710 R08: 00007fd9a47a46c0 R09: 0000000000000000
R10: 0001000000201005 R11: 0000000000000246 R12: 00007fd9acab171c
R13: 000000000000006e R14: 00007ffdd97961a0 R15: 00007ffdd9796288
</TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/13:
#0: ffffffff8c9a5cb0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x2c/0xef0 kernel/rcu/tasks.h:571
1 lock held by rcu_tasks_trace/14:
#0: ffffffff8c9a5970 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x2c/0xef0 kernel/rcu/tasks.h:571
1 lock held by khungtaskd/28:
#0: ffffffff8c9a68c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6615
5 locks held by kworker/u4:4/57:
2 locks held by getty/4784:
#0: ffff88814ac0c098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900015b72f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfcb/0x1480 drivers/tty/n_tty.c:2187
3 locks held by syz-executor122/5344:
#0: ffff88807da84410 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_sendfile64 fs/read_write.c:1322 [inline]
#0: ffff88807da84410 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_sendfile64 fs/read_write.c:1308 [inline]
#0: ffff88807da84410 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_sendfile64+0x1d6/0x220 fs/read_write.c:1308
#1: ffff888072bebd88 (mapping.invalidate_lock#3){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:826 [inline]
#1: ffff888072bebd88 (mapping.invalidate_lock#3){++++}-{3:3}, at: filemap_create_folio mm/filemap.c:2510 [inline]
#1: ffff888072bebd88 (mapping.invalidate_lock#3){++++}-{3:3}, at: filemap_get_pages+0xd14/0x1820 mm/filemap.c:2571
#2: ffff888072beb900 (&ni->ni_lock/4){+.+.}-{3:3}, at: ni_lock fs/ntfs3/ntfs_fs.h:1124 [inline]
#2: ffff888072beb900 (&ni->ni_lock/4){+.+.}-{3:3}, at: ntfs_read_folio+0xfc/0x1e0 fs/ntfs3/inode.c:717
2 locks held by syz-executor122/5345:
#0: ffff88807da84410 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_sendfile64 fs/read_write.c:1322 [inline]
#0: ffff88807da84410 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_sendfile64 fs/read_write.c:1308 [inline]
#0: ffff88807da84410 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_sendfile64+0x1d6/0x220 fs/read_write.c:1308
#1: ffff888072bebbd0 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:771 [inline]
#1: ffff888072bebbd0 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: ntfs_file_write_iter+0x296/0x1c10 fs/ntfs3/file.c:1063

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc1-next-20230714-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x2ac/0x310 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf29/0x11b0 kernel/hung_task.c:379
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
RIP: 0000:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 57 Comm: kworker/u4:4 Not tainted 6.5.0-rc1-next-20230714-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:602 [inline]
RIP: 0010:__mutex_lock+0x14f/0x1340 kernel/locking/mutex.c:747
Code: 29 49 8d 7e 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 00 0d 00 00 4d 3b 76 60 0f 85 67 07 00 00 <bf> 01 00 00 00 e8 27 ae 23 f7 49 8d 46 68 31 d2 4d 89 e1 48 89 85
RSP: 0018:ffffc90001587aa0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 1ffffffff1954708 RSI: ffffffff8a6c7cc0 RDI: ffffffff8caa3840
RBP: ffffc90001587bf0 R08: ffffffff81b25fbb R09: 0000000000000001
R10: ffffc90001587c08 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8caa37e0 R15: ffffffff9216b4c0
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056410262d680 CR3: 000000000c776000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
jump_label_lock kernel/jump_label.c:27 [inline]
static_key_disable_cpuslocked+0x10b/0x1b0 kernel/jump_label.c:233
static_key_disable+0x1a/0x20 kernel/jump_label.c:243
toggle_allocation_gate mm/kfence/core.c:836 [inline]
toggle_allocation_gate+0x13f/0x250 mm/kfence/core.c:823
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600
worker_thread+0x687/0x1110 kernel/workqueue.c:2751
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
RIP: 0000:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>


---
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If the bug is already fixed, let syzbot know by replying with:
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If you want syzbot to run the reproducer, reply with:
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If you want to change bug's subsystems, reply with:
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If you want to undo deduplication, reply with:
#syz undup

[Hillf Danton]

On Thu, 20 Jul 2023 17:28:25 -0700

> HEAD commit: 7c2878be5732 Add linux-next specific files for 20230714
> git tree: linux-next

> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=170ad732a80000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+9877b6...@syzkaller.appspotmail.com

Tested on:

commit: 052d5343 Merge tag 'exfat-for-6.8-rc1' of git://git.ke..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=15ae8135e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=fd9cd6563b562315

dashboard link: https://syzkaller.appspot.com/bug?extid=9877b6999a2554291c7d
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.