INFO: task syz.6.7646:23823 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.7646 state:D stack:0 pid:23823 tgid:23823 ppid:23397 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:710 [inline]
__close_range+0x50e/0x6c0 fs/file.c:767
__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: 0033:0x7fea4838eec9
RSP: 002b:00007ffea137c708 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 000000000008fa10 RCX: 00007fea4838eec9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fea485e7da0 R08: 0000000000000001 R09: 00000008a137c9ff
R10: 0000001b32420000 R11: 0000000000000246 R12: 00007fea485e5fac
R13: 00007fea485e5fa0 R14: ffffffffffffffff R15: 00007ffea137c820
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 414afededa5f841982d3d6a6453e4e110f7dea70
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+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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 27841 Comm: syz-executor Not tainted syzkaller #0 414afededa5f841982d3d6a6453e4e110f7dea70
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:pfn_valid include/linux/mmzone.h:2110 [inline]
RIP: 0010:__virt_addr_valid+0xdc/0x380 arch/x86/mm/physaddr.c:65
Code: ff 4c 89 fe e8 e5 85 40 00 4d 85 ff 74 0d e8 fb 80 40 00 45 31 f6 e9 d9 01 00 00 e8 ee 80 40 00 48 bf ff ff ff ff ff 3f 00 00 <48> 89 de e8 bc 85 40 00 48 89 d8 48 c1 e8 2e 74 0d e8 ce 80 40 00
RSP: 0018:ffffc90003d377b0 EFLAGS: 00000293
RAX: ffffffff81457f2d RBX: 0000000007cc09c8 RCX: ffff88811c0b0000
RDX: 0000000000000000 RSI: 0000000007cc09c8 RDI: 00003fffffffffff
RBP: ffffc90003d377d0 R08: ffff88811c0b0000 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000007cc09c8 R15: 0000000000000006
FS: 000055555c405500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555c4204a8 CR3: 00000001378fe000 CR4: 00000000003526b0
Call Trace:
check_heap_object mm/usercopy.c:191 [inline]
__check_object_size+0x158/0x810 mm/usercopy.c:257
check_object_size include/linux/thread_info.h:215 [inline]
check_copy_size include/linux/thread_info.h:251 [inline]
copy_to_user include/linux/uaccess.h:219 [inline]
xt_obj_to_user+0x91/0x110 net/netfilter/x_tables.c:299
xt_target_to_user+0xa0/0x200 net/netfilter/x_tables.c:343
copy_entries_to_user net/ipv4/netfilter/ip_tables.c:859 [inline]
get_entries net/ipv4/netfilter/ip_tables.c:1022 [inline]
do_ipt_get_ctl+0xdc7/0x1180 net/ipv4/netfilter/ip_tables.c:1668
nf_getsockopt+0x28b/0x2b0 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x14c/0x1e0 net/ipv4/ip_sockglue.c:1777
tcp_getsockopt+0x106/0x130 net/ipv4/tcp.c:4692
sock_common_getsockopt+0xaf/0xd0 net/core/sock.c:3823
do_sock_getsockopt+0x3a6/0x6d0 net/socket.c:2399
__sys_getsockopt net/socket.c:2428 [inline]
__do_sys_getsockopt net/socket.c:2438 [inline]
__se_sys_getsockopt net/socket.c:2435 [inline]
__x64_sys_getsockopt+0x1d5/0x280 net/socket.c:2435
x64_sys_call+0x10db/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:56
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: 0033:0x7f8d5a990c0a
Code: ff c3 66 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b8 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7
RSP: 002b:00007fff036ce968 EFLAGS: 00000202 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007fff036ce9f0 RCX: 00007f8d5a990c0a
RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007fff036ce98c R09: 00007fff036ceda7
R10: 00007fff036ce9f0 R11: 0000000000000202 R12: 00007f8d5abb62a0
R13: 00007fff036ce98c R14: 0000000000000000 R15: 00007f8d5abb7020