INFO: task syz.1.2136:12811 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.2136 state:D stack:24488 pid:12811 tgid:12808 ppid:12490 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5257 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6864
__schedule_loop kernel/sched/core.c:6946 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6961
super_lock+0x1c8/0x3b0 fs/super.c:115
__iterate_supers+0x126/0x290 fs/super.c:923
quota_sync_all fs/quota/quota.c:69 [inline]
__do_sys_quotactl fs/quota/quota.c:938 [inline]
__se_sys_quotactl+0x353/0x950 fs/quota/quota.c:917
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe49a38f749
RSP: 002b:00007fe49b19e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fe49a5e6090 RCX: 00007fe49a38f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007fe49a413f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe49a5e6128 R14: 00007fe49a5e6090 R15: 00007ffd2bc0e0e8
Showing all locks held in the system:
5 locks held by kworker/u8:1/13:
#0: ffff8880b863a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:639
#1: ffff8880b8724588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933
#2: ffff888025e05ea0 (k-slock-AF_INET6){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff888025e05ea0 (k-slock-AF_INET6){+.-.}-{3:3}, at: release_sock+0x2f/0x1f0 net/core/sock.c:3793
#3: ffff888025e05ea0 (k-slock-AF_INET6){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#3: ffff888025e05ea0 (k-slock-AF_INET6){+.-.}-{3:3}, at: release_sock+0x2f/0x1f0 net/core/sock.c:3793
#4: ffffffff8e33d820 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8e33d820 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#4: ffffffff8e33d820 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
#4: ffffffff8e33d820 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa5/0x2390 arch/x86/kernel/unwind_orc.c:479
1 lock held by khungtaskd/31:
#0: ffffffff8e33d820 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e33d820 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e33d820 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
6 locks held by kworker/0:2/795:
#0: ffff8880216ec548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x841/0x15a0 kernel/workqueue.c:3236
#1: ffffc90003497b80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x868/0x15a0 kernel/workqueue.c:3237
#2: ffff888029095198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
#2: ffff888029095198 (&dev->mutex){....}-{4:4}, at: hub_event+0x187/0x4ef0 drivers/usb/core/hub.c:5899
#3:
ffff8880b863a918 (&rq->__lock){-.-.}-{2:2}
, at: console_trylock_spinning kernel/printk/printk.c:2024 [inline]
, at: vprintk_emit+0x321/0x5f0 kernel/printk/printk.c:2425
#4: ffffffff99f42bd0 (&obj_hash[i].lock){-.-.}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:557 [inline]
#4: ffffffff99f42bd0 (&obj_hash[i].lock){-.-.}-{2:2}, at: try_to_wake_up+0x67/0x12b0 kernel/sched/core.c:4107
#5: ffff8880b8624588 (psi_seq){-.-.}-{0:0}, at: psi_task_change+0xd9/0x340 kernel/sched/psi.c:919
2 locks held by getty/5581:
#0: ffff8880310460a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460 drivers/tty/n_tty.c:2211
4 locks held by udevd/5840:
#0: ffff888067def668 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe20 fs/seq_file.c:182
#1: ffffffff8e449180 (fs_reclaim){+.+.}-{0:0}, at: kernfs_iop_lookup+0x5f/0x320 fs/kernfs/dir.c:1222
#2: ffff8880b8624588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933
#3: ffff88806934b010 (&sb->s_type->i_mutex_key#15/4){+.+.}-{4:4}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#3: ffff88806934b010 (&sb->s_type->i_mutex_key#15/4){+.+.}-{4:4}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#3: ffff88806934b010 (&sb->s_type->i_mutex_key#15/4){+.+.}-{4:4}, at: folio_evictable mm/internal.h:498 [inline]
#3: ffff88806934b010 (&sb->s_type->i_mutex_key#15/4){+.+.}-{4:4}, at: lru_add+0x198/0xd60 mm/swap.c:136
1 lock held by syz.6.1729/11193:
#0: ffff88807b2de0e0 (&type->s_umount_key#87/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xaa0 fs/super.c:344
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline]
watchdog+0xf95/0xfe0 kernel/hung_task.c:515
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:lock_acquire+0x5/0x340 kernel/locking/lockdep.c:5828
Code: a9 00 ff ff 00 0f 95 c0 e9 c8 66 c6 09 cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 41 55 41 54 53 48 83 ec 60 4d 89 ce 45 89 c7 41 89 cc
RSP: 0018:ffffc90000127960 EFLAGS: 00000246
RAX: e623d1beb7897a00 RBX: ffff88803371f5e0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88803371f5f8
RBP: ffff88807d22fa00 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc90000127860 R11: fffff52000024f14 R12: dffffc0000000000
R13: ffff88804e2ee000 R14: ffffffff86f0fc2c R15: 0000000000000080
FS: 0000000000000000(0000) GS:ffff888125a3e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005650b03e8150 CR3: 000000007596a000 CR4: 00000000003526f0
Call Trace:
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x36/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:886 [inline]
nsim_dev_trap_report_work+0x72c/0xb80 drivers/net/netdevsim/dev.c:921
process_one_work+0x93a/0x15a0 kernel/workqueue.c:3261
process_scheduled_works kernel/workqueue.c:3344 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246