INFO: task syz-executor:25682 blocked for more than 144 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21344 pid:25682 tgid:25682 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1585/0x5340 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
rwsem_down_write_slowpath+0x899/0x1040 kernel/locking/rwsem.c:1185
__down_write_common kernel/locking/rwsem.c:1317 [inline]
__down_write kernel/locking/rwsem.c:1326 [inline]
down_write+0x1bc/0x200 kernel/locking/rwsem.c:1591
__super_lock fs/super.c:58 [inline]
__super_lock_excl fs/super.c:73 [inline]
deactivate_super+0xa9/0xe0 fs/super.c:508
cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4472b9d897
RSP: 002b:00007ffd45cd02a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f4472c31ef0 RCX: 00007f4472b9d897
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd45cd0360
RBP: 00007ffd45cd0360 R08: 00007ffd45cd1360 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd45cd13f0
R13: 00007f4472c31ef0 R14: 000000000018fbdd R15: 00007ffd45cd1430
INFO: task syz.4.5130:27189 blocked for more than 145 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5130 state:D stack:25416 pid:27189 tgid:27186 ppid:17171 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1585/0x5340 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
jfs_flush_journal+0x729/0xef0 fs/jfs/jfs_logmgr.c:1563
jfs_sync_fs+0x7d/0xa0 fs/jfs/super.c:649
dquot_quota_sync+0xda/0x4d0 fs/quota/dquot.c:758
__iterate_supers+0x13d/0x290 fs/super.c:927
quota_sync_all fs/quota/quota.c:69 [inline]
__do_sys_quotactl fs/quota/quota.c:938 [inline]
__se_sys_quotactl+0x3a7/0x9e0 fs/quota/quota.c:917
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f64d8b9c629
RSP: 002b:00007f64d997a028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f64d8e16180 RCX: 00007f64d8b9c629
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007f64d8c32b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f64d8e16218 R14: 00007f64d8e16180 R15: 00007ffc8f4a1538
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5589:
#0: ffff888037b290a0 (&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+0x45c/0x13c0 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/25682:
#0: ffff8880577280e0 (&type->s_umount_key#83){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880577280e0 (&type->s_umount_key#83){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff8880577280e0 (&type->s_umount_key#83){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
1 lock held by syz.4.5130/27189:
#0: ffff8880577280e0 (&type->s_umount_key#83){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff8880577280e0 (&type->s_umount_key#83){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
5 locks held by syz.6.5484/29294:
1 lock held by syz.9.5494/29343:
#0: ffffffff8e766440 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580 kernel/rcu/tree.c:3828
1 lock held by dhcpcd-run-hook/29364:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [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+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
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: 29366 Comm: sed Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x36/0x70 kernel/kcov.c:217
Code: a8 0c 57 11 65 8b 15 c9 0c 57 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 54 16 00 00 00 74 2c 8b 91 30 16 00 00 <83> fa 02 75 21 48 8b 91 38 16 00 00 48 8b 32 48 8d 7e 01 8b 89 34
RSP: 0000:ffffc90004e8fa58 EFLAGS: 00000246
RAX: ffffffff82155429 RBX: ffff8880277b2180 RCX: ffff88807b74dac0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004e8fc10 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520009d1f74 R12: ffffc90004e8fdb0
R13: ffffea00029f3918 R14: ffffea00029f3900 R15: 1ffff920009d1fb6
FS: 00007fee5d7a3c80(0000) GS:ffff888125555000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fee5da39c18 CR3: 000000003567e000 CR4: 00000000003526f0
Call Trace:
do_wp_page+0x6d9/0x5a00 mm/memory.c:4219
handle_pte_fault mm/memory.c:6333 [inline]
__handle_mm_fault mm/memory.c:6455 [inline]
handle_mm_fault+0x1520/0x3310 mm/memory.c:6624
do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fee5db25487
Code: 4a 8d 0c 10 48 0f 44 c8 49 8b 86 58 01 00 00 48 8b 70 08 48 01 ce 48 39 f1 73 60 31 ff eb 17 0f 1f 40 00 4c 01 d0 48 83 c1 08 <4c> 01 10 48 8d 78 08 48 39 f1 73 35 48 8b 01 a8 01 74 e6 48 d1 e8
RSP: 002b:00007ffe1ca8f470 EFLAGS: 00010202
RAX: 00007fee5da39c18 RBX: 0000000000000000 RCX: 00007fee5d8932f8
RDX: 0000000000000018 RSI: 00007fee5d893400 RDI: 0000000000000000
RBP: 00007ffe1ca8f590 R08: 0000000000000000 R09: 00007fee5db4dda0
R10: 00007fee5d86c000 R11: 0000000000000203 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fee5db0e5f0 R15: 0000000000000000