INFO: task kworker/u8:5:954 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:5 state:D stack:0 pid:954 tgid:954 ppid:2 flags:0x00004000
Workqueue: netns cleanup_net
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
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
rcu_barrier+0x415/0x540 kernel/rcu/tree.c:4657
netdev_run_todo+0x118/0xce0 net/core/dev.c:10874
rtnl_unlock+0x12/0x20 net/core/rtnetlink.c:152
default_device_exit_batch+0x82d/0x8c0 net/core/dev.c:12041
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x747/0xc90 net/core/net_namespace.c:642
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
INFO: task syz.2.1686:5626 blocked for more than 125 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1686 state:D stack:0 pid:5626 tgid:5626 ppid:293 flags:0x00004000
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
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
exit_aio+0x2ec/0x3c0 fs/aio.c:927
__mmput+0x30/0x320 kernel/fork.c:1350
mmput+0x55/0x170 kernel/fork.c:1376
exit_mm kernel/exit.c:574 [inline]
do_exit+0x93f/0x2650 kernel/exit.c:940
do_group_exit+0x229/0x2f0 kernel/exit.c:1095
__do_sys_exit_group kernel/exit.c:1106 [inline]
__se_sys_exit_group kernel/exit.c:1104 [inline]
__x64_sys_exit_group+0x43/0x50 kernel/exit.c:1104
x64_sys_call+0x2ed2/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:232
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: 0033:0x7fc4a3d9bf79
RSP: 002b:00007fff57c72308 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc4a3d9bf79
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fff57c7236c R08: 0000000000000000 R09: 0000000000000060
R10: 00007fc4a4016038 R11: 0000000000000246 R12: 0000000000000136
R13: 0000000000000060 R14: 0000000000041eab R15: 00007fff57c723c0
INFO: task syz.5.1688:5633 blocked for more than 129 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.1688 state:D stack:0 pid:5633 tgid:5633 ppid:3456 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
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7996
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x960/0x1bb0 kernel/locking/mutex.c:803
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
rcu_barrier+0x4d/0x540 kernel/rcu/tree.c:4589
rcu_sync_dtor+0xaf/0x170 kernel/rcu/sync.c:187
percpu_free_rwsem+0x44/0x90 kernel/locking/percpu-rwsem.c:59
hci_uart_tty_close+0x210/0x230 drivers/bluetooth/hci_ldisc.c:564
tty_ldisc_close drivers/tty/tty_ldisc.c:455 [inline]
tty_ldisc_kill drivers/tty/tty_ldisc.c:613 [inline]
tty_ldisc_release+0x2ad/0x600 drivers/tty/tty_ldisc.c:781
tty_release_struct+0x2d/0xe0 drivers/tty/tty_io.c:1690
tty_release+0xc0a/0x1230 drivers/tty/tty_io.c:1861
__fput+0x1fb/0xa00 fs/file_table.c:429
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e5/0x260 kernel/task_work.c:246
resume_user_mode_work+0x35/0x50 include/linux/resume_user_mode.h:50
exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x63/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f76c2f9bf79
RSP: 002b:00007ffd8d5c93f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f76c3217da0 RCX: 00007f76c2f9bf79
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f76c3217da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f76c3217cb0 R11: 0000000000000246 R12: 0000000000044c38
R13: 00007f76c321609c R14: 00000000000449f3 R15: 00007f76c3216090
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 a14c28d9e62c02dc866229d1d178db2aa7df2752
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: 282 Comm: sshd-session Not tainted syzkaller #0 a14c28d9e62c02dc866229d1d178db2aa7df2752
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:skb_dst include/linux/skbuff.h:1152 [inline]
RIP: 0010:skb_valid_dst include/net/dst_metadata.h:94 [inline]
RIP: 0010:ip6_rcv_finish_core net/ipv6/ip6_input.c:65 [inline]
RIP: 0010:ip6_rcv_finish+0xeb/0x3e0 net/ipv6/ip6_input.c:77
Code: 00 00 00 e8 27 63 96 fc eb 05 e8 20 63 96 fc 4c 8d 73 58 4d 89 f5 49 c1 ed 03 43 80 7c 25 00 00 74 08 4c 89 f7 e8 45 3c ee fc <4d> 8b 3e 4c 89 fe 48 83 e6 fe 31 ff e8 d4 67 96 fc 49 83 e7 fe 74
RSP: 0018:ffffc90000007ac8 EFLAGS: 00000246
RAX: ffffffff84f13c18 RBX: ffff888163462b40 RCX: ffff888101be1300
RDX: 0000000000000100 RSI: ffffffff87d3e150 RDI: 000000000000003a
RBP: ffffc90000007af0 R08: ffff888101be1300 R09: 0000000000000002
R10: 0000000000000011 R11: 0000000000000100 R12: dffffc0000000000
R13: 1ffff1102c68c573 R14: ffff888163462b98 R15: 000000000000003a
FS: 00007f8f7db9f300(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe576348060 CR3: 000000010fa54000 CR4: 00000000003526b0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
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]
process_backlog+0x44b/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 kernel/softirq.c:659 [inline]
invoke_softirq kernel/softirq.c:476 [inline]
__irq_exit_rcu+0x47/0xb0 kernel/softirq.c:708
irq_exit_rcu+0xd/0x30 kernel/softirq.c:720
common_interrupt+0x97/0xb0 arch/x86/kernel/irq.c:313
asm_common_interrupt+0x2b/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:89 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x92/0x2b0 mm/kasan/generic.c:189
Code: 34 19 4d 89 f5 4d 29 dd 49 83 fd 10 7f 29 4d 85 ed 0f 84 46 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 0f 85 9f 01 00 00 <49> ff c3 48 ff c3 75 ee e9 26 01 00 00 45 89 dc 41 83 e4 07 0f 84
RSP: 0018:ffffc9000112f738 EFLAGS: 00000246
RAX: ffffffff82739101 RBX: ffffffffffffffff RCX: ffffffff82738e5f
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff88bf1928
RBP: ffffc9000112f760 R08: ffffffff88bf192b R09: 1ffffffff117e325
R10: dffffc0000000000 R11: fffffbfff117e325 R12: 0000000000000206
R13: 0000000000000001 R14: fffffbfff117e326 R15: 1ffffffff117e325
__kasan_check_write+0x18/0x20 mm/kasan/shadow.c:37
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
atomic_inc_return include/linux/atomic/atomic-instrumented.h:453 [inline]
avc_reclaim_node security/selinux/avc.c:467 [inline]
avc_alloc_node+0x11f/0x530 security/selinux/avc.c:506
avc_insert security/selinux/avc.c:619 [inline]
avc_compute_av+0xeb/0x760 security/selinux/avc.c:995
avc_perm_nonode+0xda/0x1d0 security/selinux/avc.c:1118
avc_has_perm_noaudit+0x220/0x360 security/selinux/avc.c:1161
avc_has_perm+0xd3/0x240 security/selinux/avc.c:1196
inode_has_perm security/selinux/hooks.c:1690 [inline]
file_has_perm security/selinux/hooks.c:1780 [inline]
selinux_revalidate_file_permission security/selinux/hooks.c:3649 [inline]
selinux_file_permission+0x8a4/0xb60 security/selinux/hooks.c:3670
security_file_permission+0x52/0xf0 security/security.c:2845
rw_verify_area fs/read_write.c:471 [inline]
vfs_read+0x1e8/0xcb0 fs/read_write.c:561
ksys_read+0x145/0x260 fs/read_write.c:713
__do_sys_read fs/read_write.c:723 [inline]
__se_sys_read fs/read_write.c:721 [inline]
__x64_sys_read+0x7f/0x90 fs/read_write.c:721
x64_sys_call+0x2638/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:1
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: 0033:0x7f8f7d4a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffca27b6e70 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f8f7db9f300 RCX: 00007f8f7d4a7407
RDX: 0000000000008000 RSI: 00005580ec3cb730 RDI: 0000000000000009
RBP: 00007ffca27b6f28 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000009 R14: 00005580ec3bca90 R15: 00005580ec3c4ec0
net_ratelimit: 86736 callbacks suppressed
bridge0: received packet on veth0_to_bridge with own address as source address (addr:d2:c6:d0:a9:ee:53, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:d2:c6:d0:a9:ee:53, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)