INFO: task syz.6.2504:8057 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.2504 state:D stack:0 pid:8057 tgid:8057 ppid:4238 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5996 [inline]
__schedule+0x134f/0x1ea0 kernel/sched/core.c:7843
__schedule_loop kernel/sched/core.c:7924 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7939
request_wait_answer fs/fuse/dev.c:477 [inline]
__fuse_request_send fs/fuse/dev.c:493 [inline]
__fuse_simple_request+0xdee/0x1b10 fs/fuse/dev.c:588
fuse_simple_request fs/fuse/fuse_i.h:1248 [inline]
fuse_flush+0xad9/0x2020 fs/fuse/file.c:602
filp_flush fs/open.c:1552 [inline]
filp_close+0xbd/0x160 fs/open.c:1565
__range_close fs/file.c:710 [inline]
__close_range+0x529/0x6e0 fs/file.c:767
__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: 0033:0x7fe70f99c629
RSP: 002b:00007ffdd7b12dc8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007ffdd7b12eb0 RCX: 00007fe70f99c629
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000050ac6 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2cd20000 R11: 0000000000000246 R12: 00007ffdd7b12ef0
R13: 00007fe70fc15fac R14: 0000000000050b91 R15: 00007fe70fc15fa0
INFO: task syz.6.2504:8062 blocked for more than 127 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.2504 state:D stack:0 pid:8062 tgid:8062 ppid:8057 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5996 [inline]
__schedule+0x134f/0x1ea0 kernel/sched/core.c:7843
__schedule_loop kernel/sched/core.c:7924 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7939
request_wait_answer fs/fuse/dev.c:477 [inline]
__fuse_request_send fs/fuse/dev.c:493 [inline]
__fuse_simple_request+0xdee/0x1b10 fs/fuse/dev.c:588
fuse_simple_request fs/fuse/fuse_i.h:1248 [inline]
fuse_flush+0xad9/0x2020 fs/fuse/file.c:602
filp_flush fs/open.c:1552 [inline]
filp_close+0xbd/0x160 fs/open.c:1565
close_files fs/file.c:425 [inline]
put_files_struct+0x1b5/0x330 fs/file.c:440
exit_files+0x84/0xa0 fs/file.c:457
do_exit+0x9ac/0x2650 kernel/exit.c:948
do_group_exit+0x229/0x2f0 kernel/exit.c:1095
get_signal+0x1398/0x14e0 kernel/signal.c:2933
arch_do_signal_or_restart+0xbc/0x760 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]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x57/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fe70f95cece
RSP: 002b:00007fe71087ef58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007fe71087f6c0 RCX: 00007fe70f95cece
RDX: 00007fe71087efb0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fe70fa32b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe70fc16038 R14: 00007fe70fc15fa0 R15: 00007ffdd7b12c68
INFO: task syz.5.2631:8439 blocked for more than 128 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.2631 state:D stack:0 pid:8439 tgid:8437 ppid:1265 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5996 [inline]
__schedule+0x134f/0x1ea0 kernel/sched/core.c:7843
__schedule_loop kernel/sched/core.c:7924 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7939
request_wait_answer fs/fuse/dev.c:477 [inline]
__fuse_request_send fs/fuse/dev.c:493 [inline]
__fuse_simple_request+0xdee/0x1b10 fs/fuse/dev.c:588
fuse_simple_request fs/fuse/fuse_i.h:1248 [inline]
fuse_send_open fs/fuse/file.c:53 [inline]
fuse_file_open+0x574/0x940 fs/fuse/file.c:174
fuse_do_open+0x56/0xe0 fs/fuse/file.c:204
fuse_dir_open+0x3ae/0x19d0 fs/fuse/dir.c:2028
do_dentry_open+0x978/0x1510 fs/open.c:960
vfs_open+0x86/0x240 fs/open.c:1092
do_open fs/namei.c:3782 [inline]
path_openat+0x2bb1/0x34f0 fs/namei.c:3941
do_filp_open+0x1f5/0x440 fs/namei.c:3968
do_sys_openat2+0x134/0x1d0 fs/open.c:1440
do_sys_open fs/open.c:1455 [inline]
__do_sys_openat fs/open.c:1471 [inline]
__se_sys_openat fs/open.c:1466 [inline]
__x64_sys_openat+0x13a/0x170 fs/open.c:1466
x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258
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: 0033:0x7f198639c629
RSP: 002b:00007f1984dd6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f1986616090 RCX: 00007f198639c629
RDX: 0000000000000000 RSI: 0000200000004280 RDI: ffffffffffffff9c
RBP: 00007f1986432b39 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000002c R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1986616128 R14: 00007f1986616090 R15: 00007ffe7aa61d88
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 e74179280c147a83e3a201a5967fe5af4e04851c
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1053 Comm: kworker/0:7 Not tainted syzkaller #0 e74179280c147a83e3a201a5967fe5af4e04851c
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events_power_efficient neigh_periodic_work
RIP: 0010:ipv6_chk_mcast_addr+0x0/0x3e0 net/ipv6/mcast.c:1016
Code: 00 00 e8 83 d4 07 fc 0f 0b eb 82 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 10 49
RSP: 0018:ffffc90000007418 EFLAGS: 00000246
RAX: 0000000000000010 RBX: ffff88812a791650 RCX: ffff8881340ea600
RDX: 0000000000000000 RSI: ffff8881102491a8 RDI: ffff888152df4000
RBP: ffffc900000074f8 R08: 0000000000000000 R09: ffff88812a791640
R10: 0000000000000000 R11: ffffffff84f136c0 R12: dffffc0000000000
R13: ffff8881102491a8 R14: 1ffff110254f22ca R15: ffff888152df4000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f1b250ab50 CR3: 000000010cbbc000 CR4: 00000000003526b0
Call Trace:
dst_input include/net/dst.h:469 [inline]
ip6_rcv_finish+0x360/0x3e0 net/ipv6/ip6_input.c:79
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:5763 [inline]
__netif_receive_skb net/core/dev.c:5876 [inline]
netif_receive_skb_internal net/core/dev.c:5962 [inline]
netif_receive_skb+0x147/0x7b0 net/core/dev.c:6021
br_netif_receive_skb net/bridge/br_input.c:30 [inline]
NF_HOOK include/linux/netfilter.h:317 [inline]
br_pass_frame_up+0x126/0x1b0 net/bridge/br_input.c:70
br_handle_frame_finish+0x1317/0x1760 net/bridge/br_input.c:221
nf_hook_bridge_pre net/bridge/br_input.c:301 [inline]
br_handle_frame+0x5a6/0xba0 net/bridge/br_input.c:424
__netif_receive_skb_core+0xfae/0x3ab0 net/core/dev.c:5657
__netif_receive_skb_one_core net/core/dev.c:5761 [inline]
__netif_receive_skb net/core/dev.c:5876 [inline]
process_backlog+0x3e5/0xad0 net/core/dev.c:6212
__napi_poll+0xd0/0x610 net/core/dev.c:6863
napi_poll net/core/dev.c:6932 [inline]
net_rx_action+0x5ea/0xd80 net/core/dev.c:7054
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:3238 [inline]
process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3319
worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400
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
net_ratelimit: 113845 callbacks suppressed
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:3e:ea:27:cc:0a:4f, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:3e:ea:27:cc:0a:4f, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)