INFO: task kworker/1:1:60 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:1 state:D stack:24720 pid:60 tgid:60 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: xfs-sync/loop0 xfs_flush_inodes_worker
Call Trace:
context_switch kernel/sched/core.c:5352 [inline]
__schedule+0x165c/0x5560 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7047 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7062
wb_wait_for_completion+0x3e8/0x790 fs/fs-writeback.c:227
sync_inodes_sb+0x1de/0xbd0 fs/fs-writeback.c:2924
xfs_flush_inodes_worker+0x61/0x80 fs/xfs/xfs_super.c:667
process_one_work+0x9a3/0x1710 kernel/workqueue.c:3288
process_scheduled_works kernel/workqueue.c:3379 [inline]
worker_thread+0xba8/0x11e0 kernel/workqueue.c:3465
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz.0.156:6754 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.156 state:D stack:20992 pid:6754 tgid:6753 ppid:5842 task_flags:0x400740 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5352 [inline]
__schedule+0x165c/0x5560 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7047 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7062
schedule_timeout+0xc3/0x2c0 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2cc/0x5e0 kernel/sched/completion.c:153
__flush_work+0xa17/0xc50 kernel/workqueue.c:4358
xfs_file_buffered_write+0x27d/0x8c0 fs/xfs/xfs_file.c:1079
__kernel_write_iter+0x41e/0x880 fs/read_write.c:621
dump_emit_page fs/coredump.c:1299 [inline]
dump_user_range+0xc19/0x12c0 fs/coredump.c:1373
elf_core_dump+0x34c2/0x3ad0 fs/binfmt_elf.c:2109
coredump_write+0x1216/0x1910 fs/coredump.c:1050
do_coredump fs/coredump.c:1127 [inline]
vfs_coredump+0x36a9/0x4280 fs/coredump.c:1201
get_signal+0x1107/0x1330 kernel/signal.c:3021
arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [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: 0033:0x7f85aa19c799
RSP: 002b:00007f85ab0ae028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f85aa415fa0 RCX: 00007f85aa19c799
RDX: 0000000000000084 RSI: 0000200000002540 RDI: 0000000000000003
RBP: 00007f85aa232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f85aa416038 R14: 00007f85aa415fa0 R15: 00007ffc0a6be618
Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
1 lock held by khungtaskd/30:
#0: ffffffff8e75d7e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e75d7e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e75d7e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
4 locks held by kworker/u8:2/35:
4 locks held by kworker/1:1/60:
#0: ffff8880321e2940 ((wq_completion)xfs-sync/loop0){+.+.}-{0:0}, at: process_one_work+0x890/0x1710 kernel/workqueue.c:3260
#1: ffffc9000200fc40 ((work_completion)(&mp->m_flush_inodes_work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x1710 kernel/workqueue.c:3261
#2: ffff88803240c0d8 (&type->s_umount_key#95){++++}-{4:4}, at: xfs_flush_inodes_worker+0x45/0x80 fs/xfs/xfs_super.c:666
#3: ffff88802710e810 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:396 [inline]
#3: ffff88802710e810 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x1c2/0xbd0 fs/fs-writeback.c:2922
3 locks held by kworker/u8:6/283:
1 lock held by udevd/5214:
2 locks held by getty/5599:
#0: ffff8880370700a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211
2 locks held by syz.0.156/6754:
#0: ffff88803240c410 (sb_writers#19){.+.+}-{0:0}, at: do_coredump fs/coredump.c:1127 [inline]
#0: ffff88803240c410 (sb_writers#19){.+.+}-{0:0}, at: vfs_coredump+0x36a9/0x4280 fs/coredump.c:1201
#1: ffff888059993020 (&sb->s_type->i_mutex_key#35){++++}-{4:4}, at: xfs_ilock+0xee/0x380 fs/xfs/xfs_inode.c:149
3 locks held by kworker/u8:12/7109:
4 locks held by kworker/u8:13/7147:
2 locks held by udevd/8224:
2 locks held by udevd/8343:
2 locks held by syz.1.492/8442:
#0: ffff888059bb2640 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#0: ffff888059bb2640 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:724
#1: ffff88802dc18260 (sk_lock-AF_CAN){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#1: ffff88802dc18260 (sk_lock-AF_CAN){+.+.}-{0:0}, at: j1939_sk_release+0xb1/0x7e0 net/can/j1939/socket.c:644
1 lock held by syz.4.511/8511:
1 lock held by syz.3.510/8520:
1 lock held by syz.5.513/8523:
#0: ffff88802b4780d8 (&type->s_umount_key#60/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xab0 fs/super.c:345
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
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: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+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: 8224 Comm: udevd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:409 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:419 [inline]
RIP: 0010:unwind_next_frame+0xdec/0x2550 arch/x86/kernel/unwind_orc.c:614
Code: 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 20 0f b6 04 01 84 c0 0f 85 2c 12 00 00 41 83 3e 00 0f 95 c0 49 39 df 0f 96 c1 20 c1 <49> 39 dc 0f 97 c0 20 c8 3c 01 75 18 48 8d 43 08 4c 39 f8 0f 97 c1
RSP: 0018:ffffc90004977238 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc90004977438 RCX: 1ffff9200092ee01
RDX: ffffffff90aba66a RSI: 0000000000000002 RDI: ffffffff8c287ba0
RBP: 1ffff9200092ee62 R08: 0000000000000006 R09: ffffffff8e75d7e0
R10: ffffc90004977358 R11: ffffffff81b18c30 R12: ffffc90004978000
R13: 1ffff9200092ee63 R14: ffffc90004977308 R15: ffffc90004970000
FS: 00007f9a3a819880(0000) GS:ffff888125548000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000018d030 CR3: 00000000784aa000 CR4: 00000000003526f0
Call Trace:
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4569 [inline]
slab_alloc_node mm/slub.c:4898 [inline]
kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4905
vm_area_dup+0x2b/0x680 mm/vma_init.c:123
dup_mmap+0x8b1/0x1d90 mm/mmap.c:1786
dup_mm kernel/fork.c:1544 [inline]
copy_mm+0x14d/0x690 kernel/fork.c:1596
copy_process+0x1efd/0x4430 kernel/fork.c:2271
kernel_clone+0x26d/0x8e0 kernel/fork.c:2720
__do_sys_clone kernel/fork.c:2861 [inline]
__se_sys_clone kernel/fork.c:2845 [inline]
__x64_sys_clone+0x1b6/0x230 kernel/fork.c:2845
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: 0033:0x7f9a3a0f1636
Code: 89 df e8 6d e8 f6 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 52 89 c5 85 c0 75 31 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffdaf547930 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffdaf547938 RCX: 00007f9a3a0f1636
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000555f1ce66190 R08: 0000000000000000 R09: 0000555f1065d140
R10: 00007f9a3a819b50 R11: 0000000000000246 R12: 0000555f1ce80e60
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000