INFO: task syz.3.9987:30753 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.9987 state:D stack:0 pid:30753 tgid:30753 ppid:29237 flags:0x00004006
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
request_wait_answer fs/fuse/dev.c:476 [inline]
__fuse_request_send fs/fuse/dev.c:491 [inline]
__fuse_simple_request+0xdb1/0x1980 fs/fuse/dev.c:586
fuse_simple_request fs/fuse/fuse_i.h:1248 [inline]
fuse_flush+0x909/0x1d50 fs/fuse/file.c:582
filp_flush fs/open.c:1550 [inline]
filp_close+0xc0/0x160 fs/open.c:1563
__range_close fs/file.c:712 [inline]
__close_range+0x50e/0x6c0 fs/file.c:769
__do_sys_close_range fs/open.c:1616 [inline]
__se_sys_close_range fs/open.c:1613 [inline]
__x64_sys_close_range+0x7e/0x90 fs/open.c:1613
x64_sys_call+0x1686/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:437
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f16b258eba9
RSP: 002b:00007fff7cd7ecc8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f16b27d7da0 RCX: 00007f16b258eba9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f16b27d7da0 R08: 0000000000000200 R09: 0000001c7cd7efbf
R10: 00007f16b27d7cb0 R11: 0000000000000246 R12: 0000000000090f1e
R13: 00007fff7cd7edc0 R14: ffffffffffffffff R15: 00007fff7cd7ede0
INFO: task syz.5.10075:31028 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.10075 state:D stack:0 pid:31028 tgid:31025 ppid:29375 flags:0x00004004
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
request_wait_answer fs/fuse/dev.c:476 [inline]
__fuse_request_send fs/fuse/dev.c:491 [inline]
__fuse_simple_request+0xdb1/0x1980 fs/fuse/dev.c:586
fuse_simple_request fs/fuse/fuse_i.h:1248 [inline]
fuse_lookup_name+0x2db/0x990 fs/fuse/dir.c:526
fuse_lookup+0x2ad/0x18f0 fs/fuse/dir.c:624
lookup_one_qstr_excl+0x129/0x280 fs/namei.c:1633
do_renameat2+0x45f/0xc80 fs/namei.c:5111
__do_sys_rename fs/namei.c:5217 [inline]
__se_sys_rename fs/namei.c:5215 [inline]
__x64_sys_rename+0x86/0xa0 fs/namei.c:5215
x64_sys_call+0x150b/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:83
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fe14d78eba9
RSP: 002b:00007fe14e5fd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007fe14d9d6180 RCX: 00007fe14d78eba9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000200000000280
RBP: 00007fe14d811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe14d9d6218 R14: 00007fe14d9d6180 R15: 00007ffc48e35938
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 a399eb1bb3432f3526108cc4327d2a350d41ddd4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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+0x2c7/0x370 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: 4439 Comm: syz.1.11992 Not tainted syzkaller #0 a399eb1bb3432f3526108cc4327d2a350d41ddd4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__sanitizer_cov_trace_const_cmp2+0x5/0x90 kernel/kcov.c:306
Code: 11 10 48 89 74 11 18 48 89 44 11 20 5d e9 c3 c3 08 04 cc 66 90 b8 74 b8 97 7a 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <48> 89 e5 48 8b 45 08 65 48 8b 14 25 80 eb 04 00 65 8b 0d bc 03 7f
RSP: 0018:ffffc9000410e710 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 000000ac16049b28 RCX: ffff88813896cc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc9000410e7f0 R08: ffff8881098bd877 R09: 1ffff11021317b0e
R10: dffffc0000000000 R11: ffffed1021317b0f R12: 0000000000000000
R13: 0000000000001157 R14: ffff8881098bd870 R15: ffff88813896cc00
FS: 00007f117d3dc6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000011318a000 CR4: 00000000003526b0
Call Trace:
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:5258
__folio_alloc_noprof+0x14/0x80 mm/page_alloc.c:5291
__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+0x32d/0x960 mm/filemap.c:4130
shmem_file_write_iter+0x105/0x130 mm/shmem.c:3243
__kernel_write_iter+0x395/0x830 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+0x2cd9/0x3810 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_page_fault+0x66/0xc0 arch/x86/mm/fault.c:1542
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f117c58ebb1
Code: 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffea0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f117c7d6090 RCX: 00007f117c58eba9
RDX: 0000000000000000 RSI: fffffffffffffea0 RDI: 0000000000000000
RBP: 00007f117c611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f117c7d6128 R14: 00007f117c7d6090 R15: 00007ffde5fe5198