INFO: task syz.8.2733:17640 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.2733 state:D stack:26552 pid:17640 tgid:17639 ppid:14535 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
rwsem_down_read_slowpath+0x64e/0xbf0 kernel/locking/rwsem.c:1086
__down_read_common kernel/locking/rwsem.c:1261 [inline]
__down_read kernel/locking/rwsem.c:1274 [inline]
down_read+0xef/0x480 kernel/locking/rwsem.c:1539
__super_lock fs/super.c:59 [inline]
super_lock+0x31c/0x3f0 fs/super.c:121
__iterate_supers+0x1e0/0x360 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 fs/quota/quota.c:917 [inline]
__x64_sys_quotactl+0x2b3/0x440 fs/quota/quota.c:917
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8c338ebe9
RSP: 002b:00007ff8c4154038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007ff8c35c5fa0 RCX: 00007ff8c338ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007ff8c3411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff8c35c6038 R14: 00007ff8c35c5fa0 R15: 00007ffdd84930a8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e5c1260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e5c1260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e5c1260 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
2 locks held by getty/5605:
#0: ffff88814d0f50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/5850:
#0: ffff8880562940e0 (&type->s_umount_key#85){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff8880562940e0 (&type->s_umount_key#85){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff8880562940e0 (&type->s_umount_key#85){++++}-{4:4}, at: deactivate_super fs/super.c:506 [inline]
#0: ffff8880562940e0 (&type->s_umount_key#85){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:503
1 lock held by syz.8.2733/17640:
#0: ffff8880562940e0 (&type->s_umount_key#85){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff8880562940e0 (&type->s_umount_key#85){++++}-{4:4}, at: super_lock+0x31c/0x3f0 fs/super.c:121
1 lock held by syz.3.3103/19379:
#0: ffff8880562940e0 (&type->s_umount_key#85){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff8880562940e0 (&type->s_umount_key#85){++++}-{4:4}, at: super_lock+0x31c/0x3f0 fs/super.c:121
1 lock held by syz.9.3233/19908:
#0: ffff8880562940e0 (&type->s_umount_key#85){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff8880562940e0 (&type->s_umount_key#85){++++}-{4:4}, at: super_lock+0x31c/0x3f0 fs/super.c:121
3 locks held by syz.6.3290/20123:
1 lock held by syz.2.3300/20154:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf0e/0x1260 kernel/hung_task.c:491
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 1c 62 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 53 13 16 00 fb f4 4c 09 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197df8 EFLAGS: 000002c2
RAX: 0000000002bfe007 RBX: 0000000000000001 RCX: ffffffff8b93fc29
RDX: 0000000000000000 RSI: ffffffff8de50a40 RDI: ffffffff8c162a00
RBP: ffffed1003c56488 R08: 0000000000000001 R09: ffffed10170a6655
R10: ffff8880b85332ab R11: 0000000000000000 R12: 0000000000000001
R13: ffff88801e2b2440 R14: ffffffff90ab5290 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881247b8000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000200030 CR3: 000000007459c000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:757
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:190 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:330
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x148