INFO: task syz.3.1069:3322 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1069 state:D stack:0 pid:3322 tgid:3322 ppid:292 flags:0x00000006
Call Trace:
context_switch kernel/sched/core.c:6026 [inline]
__schedule+0x1399/0x1fa0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7961 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7976
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8033
rwsem_down_write_slowpath+0x5b0/0x1bb0 kernel/locking/rwsem.c:1239
__down_write_common kernel/locking/rwsem.c:1383 [inline]
__down_write kernel/locking/rwsem.c:1392 [inline]
down_write+0x163/0x2b0 kernel/locking/rwsem.c:1659
inode_lock include/linux/fs.h:817 [inline]
fuse_flush+0x799/0x2020 fs/fuse/file.c:580
filp_flush fs/open.c:1552 [inline]
filp_close+0xc0/0x160 fs/open.c:1565
__range_close fs/file.c:726 [inline]
__close_range+0x344/0x4e0 fs/file.c:796
__do_sys_close_range fs/open.c:1618 [inline]
__se_sys_close_range fs/open.c:1615 [inline]
__x64_sys_close_range+0x7e/0x90 fs/open.c:1615
x64_sys_call+0x1686/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:437
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: 0033:0x7fca0ef9cdd9
RSP: 002b:00007ffcac43df18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007fca0f217da0 RCX: 00007fca0ef9cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fca0f217da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007fca0f217cb0 R11: 0000000000000246 R12: 000000000002cf6f
R13: 00007fca0f21609c R14: 000000000002cd52 R15: 00007fca0f216090
INFO: task syz.3.1069:3323 blocked for more than 128 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1069 state:D stack:0 pid:3323 tgid:3322 ppid:292 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:6026 [inline]
__schedule+0x1399/0x1fa0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7961 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7976
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+0x1c/0x40 kernel/sched/completion.c:148
fuse_direct_IO+0xa05/0x1310 fs/fuse/file.c:3268
generic_file_direct_write+0x192/0x3b0 mm/filemap.c:4219
fuse_cache_write_iter fs/fuse/file.c:1530 [inline]
fuse_file_write_iter+0x1800/0x2830 fs/fuse/file.c:1869
do_iter_readv_writev+0x62f/0x820 fs/read_write.c:-1
vfs_writev+0x4a8/0xe50 fs/read_write.c:1076
do_writev+0x151/0x2e0 fs/read_write.c:1123
__do_sys_writev fs/read_write.c:1196 [inline]
__se_sys_writev fs/read_write.c:1193 [inline]
__x64_sys_writev+0x81/0x90 fs/read_write.c:1193
x64_sys_call+0x1fbb/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:21
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: 0033:0x7fca0ef9cdd9
RSP: 002b:00007fca0d9f7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fca0f215fa0 RCX: 00007fca0ef9cdd9
RDX: 0000000000000020 RSI: 0000200000000400 RDI: 0000000000000005
RBP: 00007fca0f032d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fca0f216038 R14: 00007fca0f215fa0 R15: 00007ffcac43ddb8
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 4fe7cc6f12681e33e5673a6fddc2b9988498c256
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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: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+0x2c9/0x370 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: 306 Comm: kworker/1:2 Not tainted syzkaller #0 4fe7cc6f12681e33e5673a6fddc2b9988498c256
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_power_efficient neigh_periodic_work
RIP: 0010:find_match+0x59/0x10e0 net/ipv6/route.c:778
Code: 00 00 fc ff df e8 57 8c 8d fc 48 89 5d d0 48 83 c3 17 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 9a 0c 00 00 44 0f b6 3b <44> 89 fe 83 e6 01 31 ff e8 2a 8f 8d fc 44 89 f8 83 e0 01 0f 85 c8
RSP: 0018:ffffc900002301f8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88810bbf60d7 RCX: ffff88810a335f00
RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff88810bbf60c0
RBP: ffffc900002302b0 R08: ffffc90000230540 R09: ffffc90000230550
R10: ffffc900002306b0 R11: fffff520000460da R12: 0000000000000001
R13: ffffc90000230540 R14: 0000000000000003 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68220db6ac CR3: 000000010cb12000 CR4: 00000000003526b0
Call Trace:
__find_rr_leaf+0x24e/0x840 net/ipv6/route.c:869
find_rr_leaf net/ipv6/route.c:890 [inline]
rt6_select net/ipv6/route.c:934 [inline]
fib6_table_lookup+0x2ee/0x9e0 net/ipv6/route.c:2242
ip6_pol_route+0x17a/0x1370 net/ipv6/route.c:2278
ip6_pol_route_input+0x5a/0x80 net/ipv6/route.c:2335
pol_lookup_func include/net/ip6_fib.h:626 [inline]
fib6_rule_lookup+0x4ee/0x6d0 net/ipv6/fib6_rules.c:117
ip6_route_input_lookup net/ipv6/route.c:2347 [inline]
ip6_route_input+0x62e/0x8f0 net/ipv6/route.c:2643
ip6_rcv_finish_core net/ipv6/ip6_input.c:66 [inline]
ip6_rcv_finish+0x15a/0x3c0 net/ipv6/ip6_input.c:77
NF_HOOK include/linux/netfilter.h:317 [inline]
ipv6_rcv+0xf1/0x240 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core net/core/dev.c:5789 [inline]
__netif_receive_skb net/core/dev.c:5902 [inline]
process_backlog+0x44b/0xad0 net/core/dev.c:6238
__napi_poll+0xd3/0x610 net/core/dev.c:6889
napi_poll net/core/dev.c:6958 [inline]
net_rx_action+0x5ea/0xd80 net/core/dev.c:7080
handle_softirqs+0x1aa/0x630 kernel/softirq.c:621
__do_softirq+0xf/0x16 kernel/softirq.c:659
do_softirq+0xb8/0x110 kernel/softirq.c:503
__local_bh_enable_ip+0x74/0x80 kernel/softirq.c:430
__raw_write_unlock_bh include/linux/rwlock_api_smp.h:281 [inline]
_raw_write_unlock_bh+0x33/0x70 kernel/locking/spinlock.c:366
neigh_periodic_work+0xa73/0xbc0 net/core/neighbour.c:1024
process_one_work kernel/workqueue.c:3261 [inline]
process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3342
worker_thread+0xc51/0x1370 kernel/workqueue.c:3423
kthread+0x2c9/0x370 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