INFO: task syz.0.11557:6606 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.11557 state:D stack:26128 pid: 6606 ppid: 4186 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
perf_pending_task_sync+0x13c/0x1c0 kernel/events/core.c:5127
_free_event+0x34/0xe60 kernel/events/core.c:5133
put_event kernel/events/core.c:5258 [inline]
perf_event_release_kernel+0x83e/0x8d0 kernel/events/core.c:5383
perf_release+0x37/0x40 kernel/events/core.c:5393
__fput+0x234/0x930 fs/file_table.c:311
task_work_run+0x125/0x1a0 kernel/task_work.c:188
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0x626/0x20c0 kernel/exit.c:883
do_group_exit+0x12e/0x300 kernel/exit.c:997
get_signal+0x6ca/0x12c0 kernel/signal.c:2900
arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc5988c3eb9
RSP: 002b:00007fc596b1f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: fffffffffffffff4 RBX: 00007fc598b3efa0 RCX: 00007fc5988c3eb9
RDX: 0000000000000048 RSI: 00002000000008c0 RDI: 0000000000000000
RBP: 00007fc598931c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc598b3f038 R14: 00007fc598b3efa0 R15: 00007ffdaa03ee78
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c31eaa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3946:
#0: ffff88814c2fe098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc90002cf62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5df/0x1a70 drivers/tty/n_tty.c:2158
3 locks held by kworker/0:8/8157:
#0: ffff888016c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
#1: ffffc9000329fd00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
#2: ffffffff8c323430 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0xa1/0x4c0 kernel/rcu/tree.c:4043
2 locks held by kworker/1:3/7028:
#0: ffff888016c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
#1: ffffc9000311fd00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
2 locks held by syz.2.12355/9522:
1 lock held by syz.5.12372/9582:
#0: ffffffff8d43c748 (rtnl_mutex){+.+.}-{3:3}, at: devinet_ioctl+0x258/0x1a70 net/ipv4/devinet.c:1076
1 lock held by syz.2.12373/9583:
#0: ffffffff8c323430 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0xa1/0x4c0 kernel/rcu/tree.c:4043
1 lock held by syz.1.12375/9593:
#0: ffffffff8c323528 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
#0: ffffffff8c323528 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d1/0x750 kernel/rcu/tree_exp.h:845
2 locks held by syz.5.12372/9594:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe0f/0xe50 kernel/hung_task.c:369
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 9582 Comm: syz.5.12372 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:132 [inline]
RIP: 0010:lock_acquire+0x1d6/0x400 kernel/locking/lockdep.c:5626
Code: 5f 08 b8 ff ff ff ff 65 0f c1 05 85 76 a5 7e 83 f8 01 0f 85 04 01 00 00 43 c6 44 3d 04 00 48 c7 84 24 80 00 00 00 00 00 00 00 <9c> 8f 84 24 80 00 00 00 f7 84 24 80 00 00 00 00 02 00 00 43 c6 44
RSP: 0018:ffffc90000dd08e0 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 15cbf7230b003300
RDX: 0000000000000000 RSI: ffffffff8a2b3a20 RDI: ffffffff8a79f740
RBP: ffffc90000dd09e8 R08: dffffc0000000000 R09: 1ffffffff203a419
R10: dffffc0000000000 R11: fffffbfff203a41a R12: ffffffff8c331288
R13: 1ffff920001ba128 R14: 0000000000000046 R15: dffffc0000000000
FS: 00007f13cb6b26c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34a0aff8 CR3: 000000007db56000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
seqcount_lockdep_reader_access+0xcd/0x1d0 include/linux/seqlock.h:103
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get+0x7b/0x270 kernel/time/timekeeping.c:831
hrtimer_forward_now include/linux/hrtimer.h:508 [inline]
perf_swevent_hrtimer+0x4a1/0x5b0 kernel/events/core.c:10939
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x4ad/0xb70 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:unwind_next_frame+0xac/0x1d90 arch/x86/kernel/unwind_orc.c:436
Code: 84 f1 14 00 00 48 89 6c 24 18 89 44 24 7c 4c 89 ac 24 80 00 00 00 4c 89 64 24 58 4c 89 7c 24 48 bf 01 00 00 00 e8 64 53 1d 00 <4c> 8d 7b 50 4c 89 f8 48 c1 e8 03 48 89 44 24 30 42 80 3c 30 00 74
RSP: 0018:ffffc900032dea28 EFLAGS: 00000202
RAX: 0000000000000202 RBX: ffffc900032deae8 RCX: ffffffff962d8f03
RDX: dffffc0000000000 RSI: ffffffff87dc7168 RDI: 0000000000000001
RBP: ffffc900032deb30 R08: ffffc900032debb0 R09: 0000000000000005
R10: dffffc0000000000 R11: fffff5200065bd69 R12: ffffffff87dc7168
R13: ffffc900032def50 R14: dffffc0000000000 R15: 1ffff9200065bd5d
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x6b8/0x800 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
consume_skb+0xa2/0x100 net/core/skbuff.c:914
netlink_broadcast_filtered+0x107a/0x1170 net/netlink/af_netlink.c:1534
netlink_broadcast net/netlink/af_netlink.c:1556 [inline]
nlmsg_multicast include/net/netlink.h:1033 [inline]
nlmsg_notify+0xec/0x1a0 net/netlink/af_netlink.c:2550
fib6_add_rt2node net/ipv6/ip6_fib.c:1255 [inline]
fib6_add+0x1d4d/0x3d40 net/ipv6/ip6_fib.c:1484
__ip6_ins_rt net/ipv6/route.c:1305 [inline]
ip6_route_add+0x86/0x130 net/ipv6/route.c:3869
addrconf_prefix_route net/ipv6/addrconf.c:2446 [inline]
addrconf_add_linklocal+0x444/0x6c0 net/ipv6/addrconf.c:3240
addrconf_addr_gen+0x559/0x6b0 net/ipv6/addrconf.c:3369
addrconf_init_auto_addrs+0x747/0xb00 net/ipv6/addrconf.c:-1
addrconf_notify+0xa6b/0xf00 net/ipv6/addrconf.c:3662
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
call_netdevice_notifiers_extack net/core/dev.c:2074 [inline]
call_netdevice_notifiers net/core/dev.c:2088 [inline]
__dev_notify_flags+0x194/0x300 net/core/dev.c:8904
dev_change_flags+0xe3/0x1a0 net/core/dev.c:8942
devinet_ioctl+0x8dc/0x1a70 net/ipv4/devinet.c:1152
inet_ioctl+0x2fa/0x460 net/ipv4/af_inet.c:987
sock_do_ioctl+0xfb/0x320 net/socket.c:1147
sock_ioctl+0x4d2/0x710 net/socket.c:1266
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f13cd456eb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f13cb6b2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f13cd6d1fa0 RCX: 00007f13cd456eb9
RDX: 0000200000000180 RSI: 0000000000008914 RDI: 000000000000000e
RBP: 00007f13cd4c4c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f13cd6d2038 R14: 00007f13cd6d1fa0 R15: 00007ffec38de2e8