INFO: task syz.3.70597:16064 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.70597 state:D stack:0 pid:16064 tgid:16051 ppid:14783 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_timeout+0xb2/0x3a0 kernel/time/timer.c:2595
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common+0x359/0x630 kernel/sched/completion.c:127
wait_for_completion_state+0x19/0x40 kernel/sched/completion.c:264
coredump_wait fs/coredump.c:419 [inline]
do_coredump+0x7cf/0x2bd0 fs/coredump.c:581
get_signal+0x11fd/0x14f0 kernel/signal.c:2918
arch_do_signal_or_restart+0x96/0x720 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+0x4e/0xb0 kernel/entry/common.c:231
irqentry_exit+0x16/0x60 kernel/entry/common.c:334
exc_invalid_op+0x42/0x60 arch/x86/kernel/traps.c:354
asm_exc_invalid_op+0x1f/0x30 arch/x86/include/asm/idtentry.h:621
RIP: 0033:0x200000000004
RSP: 002b:00007f4586dc1a78 EFLAGS: 00010202
RAX: 0000000000000025 RBX: 00007f45885e6090 RCX: 00007f458838f6c9
RDX: 00007f4586dc1a80 RSI: 00007f4586dc1bb0 RDI: 000000000000000d
RBP: 00007f4588411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f45885e6128 R14: 00007f45885e6090 R15: 00007ffd5738ebe8
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2bf/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+0xd8f/0xed0 kernel/hung_task.c:423
kthread+0x2ca/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
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 24419 Comm: syz.1.74417 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:page_ext_get+0x11b/0x150 mm/page_ext.c:531
Code: 41 0f 95 c7 4c 89 f6 48 83 e6 01 41 0f 94 c4 31 ff e8 f9 6f a1 ff 45 84 e7 75 07 e8 0f 6b a1 ff eb 19 48 0f af 1d 75 81 b7 06 <49> 01 de 74 07 e8 fb 6a a1 ff eb 0d e8 f4 6a a1 ff e8 ef b6 8a ff
RSP: 0018:ffffc90005956710 EFLAGS: 00000202
RAX: ffffffff81e49397 RBX: 0000000005fb4b08 RCX: ffff8881228a2600
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90005956730 R08: 000000008d9fc104 R09: 00000000c6daac3b
R10: 0000000000000010 R11: ffffffff817457d0 R12: 0000000000000501
R13: dffffc0000000000 R14: ffff888102d80000 R15: dffffc0000000001
FS: 00007f6f4348b6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdacbc3ef8 CR3: 000000011f004000 CR4: 00000000003526b0
Call Trace:
__set_page_owner+0x9a/0x5d0 mm/page_owner.c:340
set_page_owner include/linux/page_owner.h:35 [inline]
post_alloc_hook+0x3b9/0x3f0 mm/page_alloc.c:1826
prep_new_page+0x1c/0x120 mm/page_alloc.c:1834
get_page_from_freelist+0x48ce/0x4960 mm/page_alloc.c:3914
__alloc_pages_noprof+0x31f/0x7b0 mm/page_alloc.c:5264
__folio_alloc_noprof+0x14/0x80 mm/page_alloc.c:5297
__folio_alloc_node_noprof include/linux/gfp.h:280 [inline]
folio_alloc_noprof include/linux/gfp.h:322 [inline]
folio_alloc_mpol_noprof include/linux/gfp.h:327 [inline]
shmem_alloc_folio mm/shmem.c:1786 [inline]
shmem_alloc_and_add_folio+0x452/0x1050 mm/shmem.c:1828
shmem_get_folio_gfp+0x5f0/0x1380 mm/shmem.c:2358
shmem_get_folio mm/shmem.c:2466 [inline]
shmem_write_begin+0xf4/0x270 mm/shmem.c:3069
generic_perform_write+0x330/0x960 mm/filemap.c:4217
shmem_file_write_iter+0x105/0x130 mm/shmem.c:3243
__kernel_write_iter+0x41a/0x8e0 fs/read_write.c:617
dump_emit_page fs/coredump.c:890 [inline]
dump_user_range+0xb06/0xdf0 fs/coredump.c:951
elf_core_dump+0x2ccc/0x3800 fs/binfmt_elf.c:2143
do_coredump+0x1bfa/0x2bd0 fs/coredump.c:764
get_signal+0x11fd/0x14f0 kernel/signal.c:2918
arch_do_signal_or_restart+0x96/0x720 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+0x4e/0xb0 kernel/entry/common.c:231
irqentry_exit+0x16/0x60 kernel/entry/common.c:334
exc_invalid_op+0x42/0x60 arch/x86/kernel/traps.c:354
asm_exc_invalid_op+0x1f/0x30 arch/x86/include/asm/idtentry.h:621
RIP: 0033:0x200000000000
Code: Unable to access opcode bytes at 0x1fffffffffd6.
RSP: 002b:00007f6f4348aa78 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00007f6f427e5fa0 RCX: 00007f6f4258f6c9
RDX: 00007f6f4348aa80 RSI: 00007f6f4348abb0 RDI: 000000000000000d
RBP: 00007f6f42611f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000805 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6f427e6038 R14: 00007f6f427e5fa0 R15: 00007ffc0af9b558