INFO: task syz-executor:1574 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:1574 tgid:1574 ppid:1 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6054 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7867
__schedule_loop kernel/sched/core.c:7944 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7959
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8016
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
rtnl_lock net/core/rtnetlink.c:79 [inline]
rtnetlink_rcv_msg+0x79e/0xa40 net/core/rtnetlink.c:6676
netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2545
rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6697
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x8bc/0xa70 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1889
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x68a/0x700 net/socket.c:2216
__do_sys_sendto net/socket.c:2228 [inline]
__se_sys_sendto net/socket.c:2224 [inline]
__x64_sys_sendto+0xe9/0x100 net/socket.c:2224
x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
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: 0033:0x7fc22d159017
RSP: 002b:00007fff5ca1b7b0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055557dd9b500 RCX: 00007fc22d159017
RDX: 000000000000002c RSI: 00007fc22df54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007fff5ca1b814 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fc22df54670 R15: 0000000000000000
INFO: task syz-executor:1576 blocked for more than 126 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:1576 tgid:1576 ppid:1 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6054 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7867
__schedule_loop kernel/sched/core.c:7944 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7959
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8016
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
rtnl_lock net/core/rtnetlink.c:79 [inline]
rtnetlink_rcv_msg+0x79e/0xa40 net/core/rtnetlink.c:6676
netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2545
rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6697
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x8bc/0xa70 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1889
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x68a/0x700 net/socket.c:2216
__do_sys_sendto net/socket.c:2228 [inline]
__se_sys_sendto net/socket.c:2224 [inline]
__x64_sys_sendto+0xe9/0x100 net/socket.c:2224
x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
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: 0033:0x7ffbfaf59017
RSP: 002b:00007ffe48fa89a0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055556f63c500 RCX: 00007ffbfaf59017
RDX: 0000000000000028 RSI: 00007ffbfbd54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffe48fa8a04 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 00007ffbfbd54670 R15: 0000000000000000
INFO: task syz-executor:1578 blocked for more than 131 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:1578 tgid:1578 ppid:1 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6054 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7867
__schedule_loop kernel/sched/core.c:7944 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7959
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8016
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
rtnl_lock net/core/rtnetlink.c:79 [inline]
rtnetlink_rcv_msg+0x79e/0xa40 net/core/rtnetlink.c:6676
netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2545
rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6697
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x8bc/0xa70 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1889
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x68a/0x700 net/socket.c:2216
__do_sys_sendto net/socket.c:2228 [inline]
__se_sys_sendto net/socket.c:2224 [inline]
__x64_sys_sendto+0xe9/0x100 net/socket.c:2224
x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
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: 0033:0x7fefc2f59017
RSP: 002b:00007ffee9bbfea0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055555b648500 RCX: 00007fefc2f59017
RDX: 0000000000000028 RSI: 00007fefc3d54670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007ffee9bbff04 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fefc3d54670 R15: 0000000000000000
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 9439e3255b4a1e8de1ac6f5994a0a4647331413b
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
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+0xe45/0xf90 kernel/hung_task.c:423
kthread+0x2c7/0x360 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: 1595 Comm: kworker/0:6 Not tainted syzkaller #0 9439e3255b4a1e8de1ac6f5994a0a4647331413b
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Workqueue: mld mld_query_work
RIP: 0010:__find_rr_leaf+0x1c/0x840 net/ipv6/route.c:829
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 20 01 00 00 <44> 89 4c 24 34 4d 89 c7 48 89 cb 89 54 24 4c 49 89 f4 49 89 fe 65
RSP: 0018:ffffc900000072e0 EFLAGS: 00000282
RAX: ffffc90000007550 RBX: ffffc900000076b0 RCX: ffffc900000076b0
RDX: 0000000000000100 RSI: ffff8881083e4400 RDI: ffff8881083e4400
RBP: ffffc90000007438 R08: ffffc90000007518 R09: 0000000000000017
R10: ffffc900000076b0 R11: fffff52000000eda R12: ffff88811f46e200
R13: dffffc0000000000 R14: 0000000000000100 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdd4c158700 CR3: 000000011ca14000 CR4: 00000000003526b0
Call Trace:
find_rr_leaf net/ipv6/route.c:893 [inline]
rt6_select net/ipv6/route.c:934 [inline]
fib6_table_lookup+0x30f/0x980 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:647 [inline]
fib6_rule_lookup+0x4f1/0x6d0 net/ipv6/fib6_rules.c:117
ip6_route_input_lookup net/ipv6/route.c:2347 [inline]
ip6_route_input+0x60d/0x8d0 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:5801 [inline]
__netif_receive_skb net/core/dev.c:5914 [inline]
process_backlog+0x472/0xaf0 net/core/dev.c:6250
__napi_poll+0xcd/0x600 net/core/dev.c:6901
napi_poll net/core/dev.c:6970 [inline]
net_rx_action+0x5dc/0xd70 net/core/dev.c:7092
handle_softirqs+0x1aa/0x620 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_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
_raw_spin_unlock_bh+0x54/0x60 kernel/locking/spinlock.c:210
spin_unlock_bh include/linux/spinlock.h:396 [inline]
mld_query_work+0xb25/0x2e20 net/ipv6/mcast.c:1528
process_one_work kernel/workqueue.c:3273 [inline]
process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354
worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
kthread+0x2c7/0x360 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