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Message-ID: <67777f13.050a0220.11076.0003.GAE@google.com>
Date: Thu, 02 Jan 2025 22:09:23 -0800
From: syzbot <syzbot+d11add3a08fc150ce457@...kaller.appspotmail.com>
To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] [fs?] INFO: task hung in __generic_file_fsync (5)
Hello,
syzbot found the following issue on:
HEAD commit: 8155b4ef3466 Add linux-next specific files for 20241220
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=162b26df980000
kernel config: https://syzkaller.appspot.com/x/.config?x=9c90bb7161a56c88
dashboard link: https://syzkaller.appspot.com/bug?extid=d11add3a08fc150ce457
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=169faaf8580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12696818580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/98a974fc662d/disk-8155b4ef.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2dea9b72f624/vmlinux-8155b4ef.xz
kernel image: https://storage.googleapis.com/syzbot-assets/593a42b9eb34/bzImage-8155b4ef.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/4da9f7f100dd/mount_0.gz
Bisection is inconclusive: the issue happens on the oldest tested release.
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14bdaac4580000
final oops: https://syzkaller.appspot.com/x/report.txt?x=16bdaac4580000
console output: https://syzkaller.appspot.com/x/log.txt?x=12bdaac4580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d11add3a08fc150ce457@...kaller.appspotmail.com
INFO: task syz-executor324:5878 blocked for more than 143 seconds.
Not tainted 6.13.0-rc3-next-20241220-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor324 state:D stack:28912 pid:5878 tgid:5861 ppid:5857 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5371 [inline]
__schedule+0x189f/0x4c80 kernel/sched/core.c:6758
__schedule_loop kernel/sched/core.c:6835 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6850
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6907
rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:863 [inline]
__generic_file_fsync+0x97/0x1a0 fs/libfs.c:1537
generic_file_fsync+0x70/0xf0 fs/libfs.c:1574
vfs_fsync_range fs/sync.c:187 [inline]
vfs_fsync fs/sync.c:201 [inline]
do_fsync fs/sync.c:212 [inline]
__do_sys_fdatasync fs/sync.c:222 [inline]
__se_sys_fdatasync fs/sync.c:220 [inline]
__x64_sys_fdatasync+0xb6/0x110 fs/sync.c:220
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f66848ece09
RSP: 002b:00007f6684882218 EFLAGS: 00000246 ORIG_RAX: 000000000000004b
RAX: ffffffffffffffda RBX: 00007f668497e6d8 RCX: 00007f66848ece09
RDX: 00007f66848ece09 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f668497e6d0 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffebef38b97 R11: 0000000000000246 R12: 00007f6684941160
R13: 0030656c69662f30 R14: 2f30656c69662f2e R15: 0031656c69662f2e
</TASK>
INFO: task syz-executor324:5879 blocked for more than 144 seconds.
Not tainted 6.13.0-rc3-next-20241220-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor324 state:D stack:29200 pid:5879 tgid:5862 ppid:5856 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5371 [inline]
__schedule+0x189f/0x4c80 kernel/sched/core.c:6758
__schedule_loop kernel/sched/core.c:6835 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6850
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6907
rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:863 [inline]
__generic_file_fsync+0x97/0x1a0 fs/libfs.c:1537
generic_file_fsync+0x70/0xf0 fs/libfs.c:1574
vfs_fsync_range fs/sync.c:187 [inline]
vfs_fsync fs/sync.c:201 [inline]
do_fsync fs/sync.c:212 [inline]
__do_sys_fdatasync fs/sync.c:222 [inline]
__se_sys_fdatasync fs/sync.c:220 [inline]
__x64_sys_fdatasync+0xb6/0x110 fs/sync.c:220
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f66848ece09
RSP: 002b:00007f6684882218 EFLAGS: 00000246 ORIG_RAX: 000000000000004b
RAX: ffffffffffffffda RBX: 00007f668497e6d8 RCX: 00007f66848ece09
RDX: 00007f66848c63c6 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f668497e6d0 R08: 00007ffebef38b97 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6684941160
R13: 0030656c69662f30 R14: 2f30656c69662f2e R15: 0031656c69662f2e
</TASK>
INFO: task syz-executor324:5874 blocked for more than 145 seconds.
Not tainted 6.13.0-rc3-next-20241220-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor324 state:D stack:28632 pid:5874 tgid:5863 ppid:5858 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5371 [inline]
__schedule+0x189f/0x4c80 kernel/sched/core.c:6758
__schedule_loop kernel/sched/core.c:6835 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6850
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6907
rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:863 [inline]
__generic_file_fsync+0x97/0x1a0 fs/libfs.c:1537
generic_file_fsync+0x70/0xf0 fs/libfs.c:1574
vfs_fsync_range fs/sync.c:187 [inline]
vfs_fsync fs/sync.c:201 [inline]
do_fsync fs/sync.c:212 [inline]
__do_sys_fdatasync fs/sync.c:222 [inline]
__se_sys_fdatasync fs/sync.c:220 [inline]
__x64_sys_fdatasync+0xb6/0x110 fs/sync.c:220
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f66848ece09
RSP: 002b:00007f6684882218 EFLAGS: 00000246 ORIG_RAX: 000000000000004b
RAX: ffffffffffffffda RBX: 00007f668497e6d8 RCX: 00007f66848ece09
RDX: 00007f66848c63c6 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f668497e6d0 R08: 00007ffebef38b97 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6684941160
R13: 0030656c69662f30 R14: 2f30656c69662f2e R15: 0031656c69662f2e
</TASK>
INFO: task syz-executor324:5876 blocked for more than 145 seconds.
Not tainted 6.13.0-rc3-next-20241220-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor324 state:D stack:29200 pid:5876 tgid:5866 ppid:5859 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5371 [inline]
__schedule+0x189f/0x4c80 kernel/sched/core.c:6758
__schedule_loop kernel/sched/core.c:6835 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6850
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6907
rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:863 [inline]
__generic_file_fsync+0x97/0x1a0 fs/libfs.c:1537
generic_file_fsync+0x70/0xf0 fs/libfs.c:1574
vfs_fsync_range fs/sync.c:187 [inline]
vfs_fsync fs/sync.c:201 [inline]
do_fsync fs/sync.c:212 [inline]
__do_sys_fdatasync fs/sync.c:222 [inline]
__se_sys_fdatasync fs/sync.c:220 [inline]
__x64_sys_fdatasync+0xb6/0x110 fs/sync.c:220
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f66848ece09
RSP: 002b:00007f6684882218 EFLAGS: 00000246 ORIG_RAX: 000000000000004b
RAX: ffffffffffffffda RBX: 00007f668497e6d8 RCX: 00007f66848ece09
RDX: 00007f66848c63c6 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f668497e6d0 R08: 00007ffebef38b97 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6684941160
R13: 0030656c69662f30 R14: 2f30656c69662f2e R15: 0031656c69662f2e
</TASK>
INFO: task syz-executor324:5877 blocked for more than 146 seconds.
Not tainted 6.13.0-rc3-next-20241220-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor324 state:D stack:28912 pid:5877 tgid:5865 ppid:5860 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5371 [inline]
__schedule+0x189f/0x4c80 kernel/sched/core.c:6758
__schedule_loop kernel/sched/core.c:6835 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6850
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6907
rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:863 [inline]
__generic_file_fsync+0x97/0x1a0 fs/libfs.c:1537
generic_file_fsync+0x70/0xf0 fs/libfs.c:1574
vfs_fsync_range fs/sync.c:187 [inline]
vfs_fsync fs/sync.c:201 [inline]
do_fsync fs/sync.c:212 [inline]
__do_sys_fdatasync fs/sync.c:222 [inline]
__se_sys_fdatasync fs/sync.c:220 [inline]
__x64_sys_fdatasync+0xb6/0x110 fs/sync.c:220
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f66848ece09
RSP: 002b:00007f6684882218 EFLAGS: 00000246 ORIG_RAX: 000000000000004b
RAX: ffffffffffffffda RBX: 00007f668497e6d8 RCX: 00007f66848ece09
RDX: 00007f66848ece09 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007f668497e6d0 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffebef38b97 R11: 0000000000000246 R12: 00007f6684941160
R13: 0030656c69662f30 R14: 2f30656c69662f2e R15: 0031656c69662f2e
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e937da0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937da0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e937da0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
1 lock held by kswapd0/89:
1 lock held by kswapd1/90:
2 locks held by getty/5589:
#0: ffff88814d95d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz-executor324/5869:
1 lock held by syz-executor324/5878:
#0: ffff88807ba6c180 (&type->i_mutex_dir_key#6){++++}-{4:4}, at: inode_lock include/linux/fs.h:863 [inline]
#0: ffff88807ba6c180 (&type->i_mutex_dir_key#6){++++}-{4:4}, at: __generic_file_fsync+0x97/0x1a0 fs/libfs.c:1537
1 lock held by syz-executor324/5872:
1 lock held by syz-executor324/5879:
#0: ffff88807ba6cc00 (&type->i_mutex_dir_key#6){++++}-{4:4}, at: inode_lock include/linux/fs.h:863 [inline]
#0: ffff88807ba6cc00 (&type->i_mutex_dir_key#6){++++}-{4:4}, at: __generic_file_fsync+0x97/0x1a0 fs/libfs.c:1537
1 lock held by syz-executor324/5870:
1 lock held by syz-executor324/5874:
#0: ffff88807ba64180 (&type->i_mutex_dir_key#6){++++}-{4:4}, at: inode_lock include/linux/fs.h:863 [inline]
#0: ffff88807ba64180 (&type->i_mutex_dir_key#6){++++}-{4:4}, at: __generic_file_fsync+0x97/0x1a0 fs/libfs.c:1537
2 locks held by syz-executor324/5871:
1 lock held by syz-executor324/5876:
#0: ffff88807ba646c0 (&type->i_mutex_dir_key#6){++++}-{4:4}, at: inode_lock include/linux/fs.h:863 [inline]
#0: ffff88807ba646c0 (&type->i_mutex_dir_key#6){++++}-{4:4}, at: __generic_file_fsync+0x97/0x1a0 fs/libfs.c:1537
5 locks held by syz-executor324/5873:
1 lock held by syz-executor324/5877:
#0: ffff88807ba6c6c0 (&type->i_mutex_dir_key#6){++++}-{4:4}, at: inode_lock include/linux/fs.h:863 [inline]
#0: ffff88807ba6c6c0 (&type->i_mutex_dir_key#6){++++}-{4:4}, at: __generic_file_fsync+0x97/0x1a0 fs/libfs.c:1537
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc3-next-20241220-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
watchdog+0xff6/0x1040 kernel/hung_task.c:397
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5871 Comm: syz-executor324 Not tainted 6.13.0-rc3-next-20241220-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:check_kcov_mode kernel/kcov.c:185 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:246 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x2f/0x90 kernel/kcov.c:314
Code: 8b 04 24 65 48 8b 14 25 c0 d6 03 00 65 8b 05 50 ae 44 7e 25 00 01 ff 00 74 10 3d 00 01 00 00 75 5b 83 ba 24 16 00 00 00 74 52 <8b> 82 00 16 00 00 83 f8 03 75 47 48 8b 8a 08 16 00 00 44 8b 8a 04
RSP: 0018:ffffc900041ced78 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff888078ef9e00
RDX: ffff888078ef9e00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900041cee80 R08: ffffffff81f7ce68 R09: 1ffffffff285af08
R10: dffffc0000000000 R11: fffffbfff285af09 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffc900041cedd8 R15: ffffc900041cedc0
FS: 00007f66848a36c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efd57688580 CR3: 000000002506c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
rcu_read_lock include/linux/rcupdate.h:850 [inline]
filemap_get_entry+0x158/0x3b0 mm/filemap.c:1820
__filemap_get_folio+0x72/0x940 mm/filemap.c:1868
__find_get_block_slow fs/buffer.c:203 [inline]
__find_get_block+0x287/0x1140 fs/buffer.c:1398
bdev_getblk+0x33/0x670 fs/buffer.c:1425
__bread_gfp+0x86/0x400 fs/buffer.c:1485
sb_bread include/linux/buffer_head.h:346 [inline]
get_branch+0x2c3/0x6e0 fs/sysv/itree.c:102
get_block+0x180/0x16d0 fs/sysv/itree.c:222
block_read_full_folio+0x3ee/0xae0 fs/buffer.c:2396
filemap_read_folio+0x148/0x3b0 mm/filemap.c:2348
do_read_cache_folio+0x373/0x5b0 mm/filemap.c:3893
read_mapping_folio include/linux/pagemap.h:1032 [inline]
dir_get_folio fs/sysv/dir.c:64 [inline]
sysv_find_entry+0x16c/0x590 fs/sysv/dir.c:154
sysv_inode_by_name+0x98/0x2a0 fs/sysv/dir.c:370
sysv_lookup+0x6b/0xe0 fs/sysv/namei.c:38
__lookup_slow+0x28c/0x3f0 fs/namei.c:1791
lookup_slow+0x53/0x70 fs/namei.c:1808
walk_component fs/namei.c:2112 [inline]
link_path_walk+0x99b/0xea0 fs/namei.c:2477
path_parentat fs/namei.c:2681 [inline]
__filename_parentat+0x2a7/0x740 fs/namei.c:2705
filename_parentat fs/namei.c:2723 [inline]
do_renameat2+0x3b8/0x13f0 fs/namei.c:5136
__do_sys_rename fs/namei.c:5271 [inline]
__se_sys_rename fs/namei.c:5269 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:5269
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f66848ece09
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f66848a3218 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f668497e6c8 RCX: 00007f66848ece09
RDX: ffffffffffffffb0 RSI: 0000000020000000 RDI: 0000000020000040
RBP: 00007f668497e6c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f6684941160
R13: 0030656c69662f30 R14: 2f30656c69662f2e R15: 0031656c69662f2e
</TASK>
---
This report 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 syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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