INFO: task syz.1.390:1437 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.390 state:D stack:0 pid:1437 tgid:1435 ppid:297 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6071 [inline]
__schedule+0x16fe/0x23d0 kernel/sched/core.c:7891
__schedule_loop kernel/sched/core.c:7966 [inline]
schedule+0xc1/0x170 kernel/sched/core.c:7981
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+0x368/0x650 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+0x885/0x3050 fs/coredump.c:629
get_signal+0x11bf/0x1490 kernel/signal.c:2927
arch_do_signal_or_restart+0xbc/0x700 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: 0033:0x7f34cef992d7
RSP: 002b:0000200000007688 EFLAGS: 00010206
RAX: 00000000000000ef RBX: 00002000000077f0 RCX: 00007f34cef992d7
RDX: 00002000000076c0 RSI: 00002000000077f0 RDI: 0000000000000021
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f34cf226128 R14: 00007f34cf226090 R15: 00007fff7bb0da48
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 1736d3b6ee88961c9d73e511fbf4428dbce80e3d
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
__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:114
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:63
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
cpumask_backtrace+0x1f/0x30 lib/nmi_backtrace.c:127
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xe45/0xf90 kernel/hung_task.c:423
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 13678 Comm: syz.2.1706 Not tainted syzkaller #0 1736d3b6ee88961c9d73e511fbf4428dbce80e3d
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:__set_page_owner+0x9a/0x600 mm/page_owner.c:341
Code: 24 30 4a 89 04 39 e8 c5 2f a0 ff e8 80 2d 7c ff 49 89 c5 89 5c 24 1c 89 df e8 22 fd ff ff 89 44 24 10 4c 89 f7 e8 86 11 02 00 <48> 85 c0 0f 84 85 03 00 00 49 89 c6 4c 89 eb 65 48 8b 15 1f c7 1b
RSP: 0018:ffffc9000f1c6740 EFLAGS: 00000293
RAX: ffff8881081162c8 RBX: 0000000000140cca RCX: ffff888117a893c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000f1c6810 R08: 00000000a130bf10 R09: 00000000fcacf207
R10: 0000000000000010 R11: ffffffff817782a0 R12: 0000000000000000
R13: 0000002b4ae09869 R14: ffffea0004ef7440 R15: dffffc0000000000
FS: 00007ffb3e7f76c0(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb00ae4a286 CR3: 000000011e586000 CR4: 00000000003526b0
Call Trace:
set_page_owner include/linux/page_owner.h:35 [inline]
post_alloc_hook+0x37d/0x3b0 mm/page_alloc.c:1864
prep_new_page+0x2d/0x180 mm/page_alloc.c:1872
get_page_from_freelist+0x4aea/0x4ba0 mm/page_alloc.c:3949
__alloc_pages_noprof+0x35a/0x7e0 mm/page_alloc.c:5316
__folio_alloc_noprof+0x14/0x80 mm/page_alloc.c:5349
__folio_alloc_node_noprof include/linux/gfp.h:284 [inline]
folio_alloc_noprof include/linux/gfp.h:326 [inline]
folio_alloc_mpol_noprof include/linux/gfp.h:331 [inline]
shmem_alloc_folio mm/shmem.c:1838 [inline]
shmem_alloc_and_add_folio+0x45f/0x10b0 mm/shmem.c:1883
shmem_get_folio_gfp+0x5cd/0x12e0 mm/shmem.c:2451
shmem_get_folio mm/shmem.c:2559 [inline]
shmem_write_begin+0xf4/0x260 mm/shmem.c:3156
generic_perform_write+0x329/0x970 mm/filemap.c:4337
shmem_file_write_iter+0x105/0x130 mm/shmem.c:3330
__kernel_write_iter+0x462/0x900 fs/read_write.c:617
dump_emit_page fs/coredump.c:938 [inline]
dump_user_range+0xb8b/0xe60 fs/coredump.c:999
elf_core_dump+0x2d61/0x3840 fs/binfmt_elf.c:2143
do_coredump+0x20d5/0x3050 fs/coredump.c:812
get_signal+0x11bf/0x1490 kernel/signal.c:2927
arch_do_signal_or_restart+0xbc/0x700 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: 0033:0x2000000002c2
Code: c5 a8 c0 e6 c3 35 5d ea 45 60 d5 6e 11 0e 37 cc f2 4f de bb 14 21 5c 96 7c 56 27 a3 2d 00 00 00 00 00 00 00 00 00 00 00 14 00 <00> 00 52 00 01 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 002b:0000200000000188 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 00007ffb3dc25fa0 RCX: 00007ffb3d99f559
RDX: 00002000000001c0 RSI: 0000200000000180 RDI: 0000000002000000
RBP: 00007ffb3da36b50 R08: 0000200000000240 R09: 0000200000000240
R10: 0000200000000200 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffb3dc26038 R14: 00007ffb3dc25fa0 R15: 00007ffddef75cf8