INFO: task syz.1.635:2225 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.635       state:D stack:0     pid:2225  tgid:2223  ppid:291    flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6016 [inline]
 __schedule+0x1399/0x1fa0 kernel/sched/core.c:7870
 __schedule_loop kernel/sched/core.c:7951 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7966
 schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0x369/0x650 kernel/sched/completion.c:127
 wait_for_completion_state+0x19/0x40 kernel/sched/completion.c:264
 coredump_wait fs/coredump.c:448 [inline]
 do_coredump+0x8ad/0x2fe0 fs/coredump.c:629
 get_signal+0x11f8/0x14e0 kernel/signal.c:2918
 arch_do_signal_or_restart+0xbc/0x760 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 irqentry_exit_to_user_mode+0x4d/0xb0 kernel/entry/common.c:231
 irqentry_exit+0x16/0x60 kernel/entry/common.c:334
 exc_page_fault+0x65/0xc0 arch/x86/mm/fault.c:1537
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f02d0455d36
RSP: 002b:00007f02d1495f60 EFLAGS: 00010206
RAX: 0000000000000020 RBX: 0000000000000000 RCX: 0000200000706000
RDX: 00000000000025f5 RSI: 0000200000706000 RDI: 0000200000707000
RBP: 00007f02d0651c60 R08: 0000000000000000 R09: 000000000000000a
R10: 000000000000000a R11: 0000000000000000 R12: 00000000003ff000
R13: 0000200000706000 R14: 00007f02d0816090 R15: 0000000000000000
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 a40991d314adffa3075cd603e5b19eadab4cccf0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xdad/0xf00 kernel/hung_task.c:423
 kthread+0x2c6/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 110 Comm: udevd Not tainted syzkaller #0 a40991d314adffa3075cd603e5b19eadab4cccf0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:stack_trace_consume_entry+0x5/0x2a0 kernel/stacktrace.c:83
Code: 5e 5d e9 8e ba 2d 04 cc e8 68 5c 2b 04 0f 1f 84 00 00 00 00 00 b8 59 0d ef ee 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <48> 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 20 48 ba 00 00 00 00
RSP: 0018:ffffc90000e7f158 EFLAGS: 00000257
RAX: ffffffff81dfb023 RBX: ffffc90000e7f220 RCX: 0000000000e7f100
RDX: ffffc90000e7f501 RSI: ffffffff81dfb023 RDI: ffffc90000e7f220
RBP: ffffc90000e7f1f0 R08: ffffc90000e7f230 R09: ffffc90000e7f228
R10: 0000000000000000 R11: ffffffff8175d830 R12: ffff88810cb13900
R13: ffff888137f0c110 R14: ffffffff8175d830 R15: ffffc90000e7f168
FS:  00007f286e74b880(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd2a905dfc0 CR3: 000000010d39c000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:49 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:70
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565
 unpoison_slab_object mm/kasan/common.c:321 [inline]
 __kasan_slab_alloc+0x73/0x90 mm/kasan/common.c:347
 kasan_slab_alloc include/linux/kasan.h:251 [inline]
 slab_post_alloc_hook mm/slub.c:4202 [inline]
 slab_alloc_node mm/slub.c:4251 [inline]
 kmem_cache_alloc_lru_noprof+0x1c2/0x410 mm/slub.c:4272
 __d_alloc+0x42/0x8e0 fs/dcache.c:1636
 d_alloc_parallel+0xe4/0x1320 fs/dcache.c:2478
 __lookup_slow+0x150/0x420 fs/namei.c:1725
 lookup_slow+0x57/0x80 fs/namei.c:1757
 walk_component fs/namei.c:2061 [inline]
 link_path_walk+0x990/0xec0 fs/namei.c:2426
 path_openat+0x287/0x34f0 fs/namei.c:3937
 do_filp_open+0x1f5/0x440 fs/namei.c:3968
 do_sys_openat2+0x134/0x1d0 fs/open.c:1440
 do_sys_open fs/open.c:1455 [inline]
 __do_sys_openat fs/open.c:1471 [inline]
 __se_sys_openat fs/open.c:1466 [inline]
 __x64_sys_openat+0x13a/0x170 fs/open.c:1466
 x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f286e0a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffc531f3de0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f286e74b880 RCX: 00007f286e0a7407
RDX: 0000000000080000 RSI: 00007ffc531f3f60 RDI: ffffffffffffff9c
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055bd048d57f5
R13: 000055bd048d57f5 R14: 0000000000000001 R15: 0000000000000000
 </TASK>