INFO: task syz-executor.2:13220 blocked for more than 143 seconds.
Not tainted 6.8.0-rc2-next-20240202-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:19824 pid:13220 tgid:13220 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x17df/0x4a40 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6804 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6819
schedule_timeout+0xb0/0x310 kernel/time/timer.c:2159
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
__flush_workqueue+0x730/0x1630 kernel/workqueue.c:3617
xfs_inodegc_wait_all fs/xfs/xfs_icache.c:465 [inline]
xfs_inodegc_flush+0xe1/0x3e0 fs/xfs/xfs_icache.c:1912
xfs_unmountfs+0x25/0x200 fs/xfs/xfs_mount.c:1064
xfs_fs_put_super+0x65/0x140 fs/xfs/xfs_super.c:1136
generic_shutdown_super+0x136/0x2d0 fs/super.c:646
kill_block_super+0x44/0x90 fs/super.c:1680
xfs_kill_sb+0x15/0x50 fs/xfs/xfs_super.c:2026
deactivate_locked_super+0xc4/0x130 fs/super.c:477
cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267
task_work_run+0x24f/0x310 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:212
do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f6dee07f0d7
RSP: 002b:00007fff7b410528 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f6dee07f0d7
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007fff7b4105e0
RBP: 00007fff7b4105e0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff7b4116a0
R13: 00007f6dee0c93b9 R14: 0000000000101bfe R15: 000000000000000b
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4824:
#0: ffff88802a99c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031432f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.2/13220:
#0: ffff88804cce20e0 (&type->s_umount_key#88){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88804cce20e0 (&type->s_umount_key#88){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88804cce20e0 (&type->s_umount_key#88){+.+.}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:509
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc2-next-20240202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
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:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xfb0/0xff0 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 145 Comm: kworker/u4:5 Not tainted 6.8.0-rc2-next-20240202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:__lock_release kernel/locking/lockdep.c:5415 [inline]
RIP: 0010:lock_release+0x1dd/0x9d0 kernel/locking/lockdep.c:5774
Code: 00 01 00 00 00 48 c7 c0 6c ea 85 8f 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 62 05 00 00 83 3d 05 52 14 0e 00 0f 84 c7 03 00 00 <4d> 8d b5 d0 0a 00 00 4c 89 f0 48 c1 e8 03 48 89 44 24 48 42 0f b6
RSP: 0018:ffffc90002d7f9e0 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000246 RCX: ffffc90002d7fa03
RDX: 1ffff920005aff4c RSI: ffffffff8baac340 RDI: ffffffff8bfe7a60
RBP: ffffc90002d7fb18 R08: ffffffff8f85b72f R09: 1ffffffff1f0b6e5
R10: dffffc0000000000 R11: fffffbfff1f0b6e6 R12: 1ffff920005aff48
R13: ffff88801bb99e00 R14: ffffc90002d7fa90 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff39cfb058 CR3: 000000000df32000 CR4: 00000000003506f0
Call Trace:
rcu_lock_release include/linux/rcupdate.h:308 [inline]
rcu_read_unlock include/linux/rcupdate.h:783 [inline]
batadv_nc_process_nc_paths+0x2f5/0x3a0 net/batman-adv/network-coding.c:699
batadv_nc_worker+0x42a/0x610 net/batman-adv/network-coding.c:728
process_one_work kernel/workqueue.c:3049 [inline]
process_scheduled_works+0x913/0x14f0 kernel/workqueue.c:3125
worker_thread+0xa60/0x1000 kernel/workqueue.c:3206
kthread+0x2f0/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242