INFO: task syz.1.913:14061 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.913 state:D stack:28920 pid:14061 tgid:14054 ppid:13021 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1681/0x54c0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7564
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1662 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1739 [inline]
__rt_mutex_slowlock_locked+0x1f28/0x2550 kernel/locking/rtmutex.c:1779
__rwbase_read_lock+0xc3/0x180 kernel/locking/rwbase_rt.c:114
rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline]
__down_read kernel/locking/rwsem.c:1496 [inline]
down_read+0x132/0x200 kernel/locking/rwsem.c:1570
__super_lock fs/super.c:60 [inline]
super_lock+0x2d6/0x3d0 fs/super.c:122
__iterate_supers+0x126/0x250 fs/super.c:926
ksys_sync fs/sync.c:102 [inline]
__ia32_sys_sync+0xa0/0x120 fs/sync.c:111
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f731653cdd9
RSP: 002b:00007f7314775028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f73167b6090 RCX: 00007f731653cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f73167b6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f73167b6128 R14: 00007f73167b6090 R15: 00007ffca88b8ca8
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8dfc8140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8dfc8140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8dfc8140 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/u8:12/1559:
#0: ffff88801a074138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3277 [inline]
#0: ffff88801a074138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3385
#1: ffffc90006adfc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3278 [inline]
#1: ffffc90006adfc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3385
#2: ffffffff8f356af8 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:313
2 locks held by getty/5350:
#0: ffff8880372180a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cbe2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13a0 drivers/tty/n_tty.c:2211
4 locks held by syz-executor/11219:
2 locks held by udevd/13045:
3 locks held by udevd/13507:
#0: ffff8880376fc480 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2724 [inline]
#0: ffff8880376fc480 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x22d/0xba0 fs/read_write.c:684
#1: ffff8880342164a0 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline]
#1: ffff8880342164a0 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: shmem_file_write_iter+0x82/0x120 mm/shmem.c:3468
#2: ffff8880b8833f10 ((lock)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#2: ffff8880b8833f10 ((lock)#2){+.+.}-{3:3}, at: __folio_batch_add_and_move+0x283/0xa90 mm/swap.c:-1
1 lock held by syz.1.913/14061:
#0: ffff88806029e0d0 (&type->s_umount_key#80){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff88806029e0d0 (&type->s_umount_key#80){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
1 lock held by syz.6.924/14192:
#0: ffff88806029e0d0 (&type->s_umount_key#80){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff88806029e0d0 (&type->s_umount_key#80){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
1 lock held by syz.7.1064/15548:
#0: ffff88806029e0d0 (&type->s_umount_key#80){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff88806029e0d0 (&type->s_umount_key#80){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
1 lock held by syz.7.1064/15549:
#0: ffff88806029e0d0 (&type->s_umount_key#80){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff88806029e0d0 (&type->s_umount_key#80){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
8 locks held by syz-executor/15802:
10 locks held by syz.2.1107/15922:
2 locks held by syz.2.1107/15958:
#0: ffff888032948458 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: process_measurement+0x7fd/0x1c90 security/integrity/ima/ima_main.c:319
#1: ffff88803450da98 (btrfs-tree-01){++++}-{4:4}, at: btrfs_tree_read_lock_nested+0x33/0x220 fs/btrfs/locking.c:146
3 locks held by udevadm/15956:
5 locks held by syz.0.1112/15972:
#0: ffff88804f288308 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:310
#1: ffffffff8dfc8140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#1: ffffffff8dfc8140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#1: ffffffff8dfc8140 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x200 mm/pgtable-generic.c:290
#2: ffff8880339621d8 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#2: ffff8880339621d8 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: pte_offset_map_lock+0x13d/0x210 mm/pgtable-generic.c:404
#3: ffffffff8dfc8140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#3: ffffffff8dfc8140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#3: ffffffff8dfc8140 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline]
#3: ffffffff8dfc8140 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400 kernel/locking/spinlock_rt.c:57
#4: ffff8880b8833f10 ((lock)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#4: ffff8880b8833f10 ((lock)#2){+.+.}-{3:3}, at: __folio_batch_add_and_move+0x283/0xa90 mm/swap.c:-1
2 locks held by syz.8.1114/15981:
1 lock held by syz.9.1111/15980:
5 locks held by dhcpcd-run-hook/15984:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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:162 [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:353 [inline]
watchdog+0xfd3/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15984 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:debug_activate kernel/time/hrtimer.c:529 [inline]
RIP: 0010:remove_and_enqueue_same_base kernel/time/hrtimer.c:1259 [inline]
RIP: 0010:__hrtimer_start_range_ns kernel/time/hrtimer.c:1396 [inline]
RIP: 0010:hrtimer_start_range_ns+0x583/0xef0 kernel/time/hrtimer.c:1491
Code: ff df 43 0f b6 04 2c 84 c0 0f 85 b9 07 00 00 41 0f b6 5f 38 4c 89 ff 48 c7 c6 00 6d 4f 8b e8 64 ec fa 02 4c 89 ff 8b 74 24 14 <89> da e8 86 7d 00 00 48 8d 5d 08 48 89 d8 48 c1 e8 03 42 0f b6 04
RSP: 0018:ffffc9000e56f1e0 EFLAGS: 00000082
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 000000000000000a RDI: ffff8880b883c540
RBP: ffff8880b8828680 R08: ffffffff99aa94cb R09: 1ffffffff3355299
R10: dffffc0000000000 R11: fffffbfff335529a R12: 1ffff110171078af
R13: dffffc0000000000 R14: 000000c5783873fa R15: ffff8880b883c540
FS: 00007f0a3ee01c80(0000) GS:ffff888126179000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76fb5e0000 CR3: 000000004e43e000 CR4: 00000000003526f0
Call Trace:
hrtimer_start include/linux/hrtimer.h:220 [inline]
hrtick_cond_restart kernel/sched/core.c:924 [inline]
hrtick_schedule_exit kernel/sched/core.c:986 [inline]
finish_lock_switch kernel/sched/core.c:5124 [inline]
finish_task_switch+0x3cd/0xbe0 kernel/sched/core.c:5243
context_switch kernel/sched/core.c:5391 [inline]
__schedule+0x1689/0x54c0 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule_rtlock+0x30/0x70 kernel/sched/core.c:7347
rtlock_slowlock_locked+0x3638/0x3c80 kernel/locking/rtmutex.c:1887
rtlock_slowlock kernel/locking/rtmutex.c:1914 [inline]
rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
rt_spin_lock+0x165/0x400 kernel/locking/spinlock_rt.c:57
spin_lock include/linux/spinlock_rt.h:45 [inline]
__folio_batch_add_and_move+0x283/0xa90 mm/swap.c:-1
folio_add_lru_vma+0x196/0x210 mm/swap.c:536
wp_page_copy mm/memory.c:3927 [inline]
do_wp_page+0x2443/0x3d90 mm/memory.c:4320
handle_pte_fault mm/memory.c:6427 [inline]
__handle_mm_fault mm/memory.c:6549 [inline]
handle_mm_fault+0x9f5/0x13c0 mm/memory.c:6718
do_user_addr_fault+0x75b/0x1340 arch/x86/mm/fault.c:1385
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: 0010:__put_user_4+0xd/0x20 arch/x86/lib/putuser.S:94
Code: 66 89 01 31 c9 0f 01 ca c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000e56fe48 EFLAGS: 00050206
RAX: 0000000000003e70 RBX: 0000000000000000 RCX: 00007f0a3ee01f50
RDX: 0000000000000000 RSI: ffffffff8d86225e RDI: ffff8880286d9ec0
RBP: ffffc9000e56ff38 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f11c3f R12: 1ffff110050db4be
R13: dffffc0000000000 R14: ffff8880286d9ec0 R15: dffffc0000000000
schedule_tail+0x9d/0xc0 kernel/sched/core.c:5320
ret_from_fork+0x83/0xb70 arch/x86/kernel/process.c:154
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245