INFO: task syz-executor.4:30155 blocked for more than 143 seconds.
Not tainted 6.8.0-rc5-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:24408 pid:30155 tgid:30154 ppid:5095 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6874
rwsem_down_write_slowpath+0xeea/0x13b0 kernel/locking/rwsem.c:1178
__down_write_common+0x1ae/0x200 kernel/locking/rwsem.c:1306
__super_lock fs/super.c:56 [inline]
super_lock+0x196/0x400 fs/super.c:120
super_lock_excl fs/super.c:145 [inline]
grab_super+0xaf/0x370 fs/super.c:534
sget_fc+0x200/0x780 fs/super.c:793
vfs_get_super fs/super.c:1268 [inline]
get_tree_single+0x2f/0x150 fs/super.c:1300
vfs_get_tree+0x90/0x2a0 fs/super.c:1784
do_new_mount+0x2be/0xb40 fs/namespace.c:3352
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f9ef427dda9
RSP: 002b:00007f9ef50530c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f9ef43abf80 RCX: 00007f9ef427dda9
RDX: 0000000020002240 RSI: 0000000020002200 RDI: 00000000200021c0
RBP: 00007f9ef42ca47a R08: 0000000020002280 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9ef43abf80 R15: 00007fffd5229098
Showing all locks held in the system:
4 locks held by kworker/u4:0/11:
1 lock held by khungtaskd/29:
#0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4812:
#0: ffff88802f9da0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002efe2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.3/9732:
#0: ffff88804a5040e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88804a5040e0 (&type->s_umount_key#65){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88804a5040e0 (&type->s_umount_key#65){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:509
1 lock held by syz-executor.2/10417:
1 lock held by syz-executor.0/11723:
#0: ffff88807d4b40e0 (&type->s_umount_key#67){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807d4b40e0 (&type->s_umount_key#67){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807d4b40e0 (&type->s_umount_key#67){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:509
2 locks held by syz-executor.1/29922:
1 lock held by syz-executor.4/30155:
#0: ffff88807a91e0e0 (&type->s_umount_key#118){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807a91e0e0 (&type->s_umount_key#118){++++}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120
1 lock held by syz-executor.1/31301:
#0: ffff88807a91e0e0 (&type->s_umount_key#118){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88807a91e0e0 (&type->s_umount_key#118){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz-executor.4/31329:
#0: ffff88807a91e0e0 (&type->s_umount_key#118){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88807a91e0e0 (&type->s_umount_key#118){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
2 locks held by kworker/0:5/31711:
#0: ffff888014c8e538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#0: ffff888014c8e538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#1: ffffc9000ab3fd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#1: ffffc9000ab3fd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
1 lock held by syz-executor.1/31719:
#0: ffff88807a91e0e0 (&type->s_umount_key#118){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88807a91e0e0 (&type->s_umount_key#118){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz-executor.4/31747:
#0: ffff88807a91e0e0 (&type->s_umount_key#118){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88807a91e0e0 (&type->s_umount_key#118){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
1 lock held by syz-executor.2/31859:
#0: ffff8880b943c918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc5-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+0xfaf/0xff0 kernel/hung_task.c:379
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 29922 Comm: syz-executor.1 Not tainted 6.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:67 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:127 [inline]
RIP: 0010:lock_release+0x5f2/0x9d0 kernel/locking/lockdep.c:5777
Code: f8 01 0f 85 9a 00 00 00 4c 89 f3 48 c1 eb 03 42 80 3c 3b 00 74 08 4c 89 f7 e8 4a fb 80 00 48 c7 84 24 90 00 00 00 00 00 00 00 <9c> 8f 84 24 90 00 00 00 42 80 3c 3b 00 74 08 4c 89 f7 e8 37 fa 80
RSP: 0018:ffffc9000a40f9e0 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 1ffff92001481f4e RCX: ffffc9000a40fa03
RDX: 0000000000000002 RSI: ffffffff8baac740 RDI: ffffffff8bfd9920
RBP: ffffc9000a40fb18 R08: ffffffff8f8439ef R09: 1ffffffff1f0873d
R10: dffffc0000000000 R11: fffffbfff1f0873e R12: 1ffff92001481f48
R13: 0000000000000246 R14: ffffc9000a40fa70 R15: dffffc0000000000
FS: 00007fce2744b6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feaf2360f00 CR3: 0000000031f86000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
_raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
d_walk+0x686/0x710 fs/dcache.c:1308
shrink_dcache_parent+0x144/0x3b0 fs/dcache.c:1487
do_one_tree+0x23/0xe0 fs/dcache.c:1538
shrink_dcache_for_umount+0x7d/0x130 fs/dcache.c:1555
generic_shutdown_super+0x6a/0x2d0 fs/super.c:624
kill_anon_super fs/super.c:1230 [inline]
kill_litter_super+0x76/0xb0 fs/super.c:1240
gadgetfs_kill_sb+0x26/0x110 drivers/usb/gadget/legacy/inode.c:2111
deactivate_locked_super+0xc4/0x130 fs/super.c:477
cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267
task_work_run+0x24e/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+0x167/0x370 kernel/entry/common.c:212
do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fce2667dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007fce2744b0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffec RBX: 00007fce267abf80 RCX: 00007fce2667dda9
RDX: 0000000020002240 RSI: 0000000020002200 RDI: 00000000200021c0
RBP: 00007fce266ca47a R08: 0000000020002280 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fce267abf80 R15: 00007ffd28030be8