[syzbot] [hfs?] INFO: task hung in hfsplus_find_init

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a747acc0b752 Merge tag 'linux-kselftest-next-6.6-rc2' of g..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=164b208c680000
kernel config: https://syzkaller.appspot.com/x/.config?x=df91a3034fe3f122
dashboard link: https://syzkaller.appspot.com/bug?extid=a0767f147b6b55daede8
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16fb6508680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16473130680000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b28ecb88c714/disk-a747acc0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/03dd2cd5356f/vmlinux-a747acc0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/63365d9bf980/bzImage-a747acc0.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/40cbe4c7d1f5/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a0767f...@syzkaller.appspotmail.com

INFO: task kworker/u4:4:59 blocked for more than 143 seconds.
Not tainted 6.6.0-rc1-syzkaller-00014-ga747acc0b752 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:4 state:D stack:21480 pid:59 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1873/0x48f0 kernel/sched/core.c:6695
schedule+0xc3/0x180 kernel/sched/core.c:6771
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6830
__mutex_lock_common+0xe33/0x2530 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
hfsplus_find_init+0x14a/0x1c0
hfsplus_ext_read_extent fs/hfsplus/extents.c:216 [inline]
hfsplus_file_extend+0x454/0x1b70 fs/hfsplus/extents.c:461
hfsplus_bmap_reserve+0x105/0x4e0 fs/hfsplus/btree.c:358
__hfsplus_ext_write_extent+0x2a4/0x5b0 fs/hfsplus/extents.c:104
hfsplus_ext_write_extent_locked fs/hfsplus/extents.c:139 [inline]
hfsplus_ext_write_extent+0x16a/0x1f0 fs/hfsplus/extents.c:150
hfsplus_write_inode+0x22/0x5e0 fs/hfsplus/super.c:154
write_inode fs/fs-writeback.c:1456 [inline]
__writeback_single_inode+0x69b/0xfa0 fs/fs-writeback.c:1668
writeback_sb_inodes+0x8e3/0x11d0 fs/fs-writeback.c:1894
__writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:1965
wb_writeback+0x461/0xc60 fs/fs-writeback.c:2072
wb_check_old_data_flush fs/fs-writeback.c:2176 [inline]
wb_do_writeback fs/fs-writeback.c:2229 [inline]
wb_workfn+0xbb5/0xff0 fs/fs-writeback.c:2257
process_one_work+0x781/0x1130 kernel/workqueue.c:2630
process_scheduled_works kernel/workqueue.c:2703 [inline]
worker_thread+0xabf/0x1060 kernel/workqueue.c:2784
kthread+0x2b8/0x350 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
</TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.6.0-rc1-syzkaller-00014-ga747acc0b752 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x310 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+0xdf5/0xe40 kernel/hung_task.c:379
kthread+0x2b8/0x350 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5033 Comm: syz-executor404 Not tainted 6.6.0-rc1-syzkaller-00014-ga747acc0b752 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0010:dequeue_task+0x0/0x540 kernel/sched/core.c:2109
Code: c0 75 14 89 6b 68 4c 89 f7 48 89 de 44 89 fa 5b 41 5e 41 5f 5d eb 13 89 f9 80 e1 07 80 c1 03 38 c1 7c e0 e8 c2 fa 86 00 eb d9 <55> 41 57 41 56 41 55 41 54 53 50 41 89 d7 49 89 f5 48 89 fb 48 ba
RSP: 0018:ffffc90003c9f9d8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88807e6e9dc0 RCX: dffffc0000000000
RDX: 0000000000000009 RSI: ffff88807e6e9dc0 RDI: ffff8880b983c300
RBP: ffffc90003c9fc08 R08: ffff88807e6e9dc7 R09: 1ffff1100fcdd3b8
R10: dffffc0000000000 R11: ffffed100fcdd3b9 R12: 0000000000002001
R13: ffffc90003c9fd98 R14: 1ffff1100fcdd3b8 R15: dffffc0000000000
FS: 00005555562d8380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001300 CR3: 000000007498d000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
deactivate_task kernel/sched/core.c:2141 [inline]
__schedule+0x612/0x48f0 kernel/sched/core.c:6649
schedule+0xc3/0x180 kernel/sched/core.c:6771
do_nanosleep+0x18a/0x610 kernel/time/hrtimer.c:2047
hrtimer_nanosleep+0x226/0x460 kernel/time/hrtimer.c:2100
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1396 [inline]
__se_sys_clock_nanosleep+0x327/0x3b0 kernel/time/posix-timers.c:1373
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f83775a55b3
Code: 00 00 00 00 0f 1f 00 83 ff 03 74 7b 83 ff 02 b8 fa ff ff ff 49 89 ca 0f 44 f8 80 3d ee fa 03 00 00 74 14 b8 e6 00 00 00 0f 05 <f7> d8 c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 28 48 89 54 24 10
RSP: 002b:00007ffe226c6838 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000003ff0 RCX: 00007f83775a55b3
RDX: 00007ffe226c6850 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000460e0 R08: 0000000000000010 R09: 00007ffe227d30b0
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe226c68a0
R13: 00007ffe226c688c R14: 431bde82d7b634db R15: 00007f83775b503b
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.089 msecs


---
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[syzbot]

syzbot suspects this issue was fixed by commit:

commit 6f861765464f43a71462d52026fbddfc858239a5
Author: Jan Kara <ja...@suse.cz>
Date: Wed Nov 1 17:43:10 2023 +0000

fs: Block writes to mounted block devices

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11dd6ea0180000
start commit: a747acc0b752 Merge tag 'linux-kselftest-next-6.6-rc2' of g..
git tree: upstream

kernel config: https://syzkaller.appspot.com/x/.config?x=df91a3034fe3f122
dashboard link: https://syzkaller.appspot.com/bug?extid=a0767f147b6b55daede8

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16fb6508680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16473130680000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: fs: Block writes to mounted block devices

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[Jan Kara]

On Fri 26-01-24 23:24:03, syzbot wrote:
> syzbot suspects this issue was fixed by commit:
>
> commit 6f861765464f43a71462d52026fbddfc858239a5
> Author: Jan Kara <ja...@suse.cz>
> Date: Wed Nov 1 17:43:10 2023 +0000
>
> fs: Block writes to mounted block devices
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11dd6ea0180000
> start commit: a747acc0b752 Merge tag 'linux-kselftest-next-6.6-rc2' of g..
> git tree: upstream
> kernel config: https://syzkaller.appspot.com/x/.config?x=df91a3034fe3f122
> dashboard link: https://syzkaller.appspot.com/bug?extid=a0767f147b6b55daede8
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16fb6508680000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16473130680000
>
> If the result looks correct, please mark the issue as fixed by replying with:

Makes sense:

#syz fix: fs: Block writes to mounted block devices

Honza
--
Jan Kara <ja...@suse.com>
SUSE Labs, CR