INFO: task kworker/1:1:27882 blocked for more than 143 seconds.
      Not tainted 5.15.0-rc6-next-20211020-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:1     state:D stack:23912 pid:27882 ppid:     2 flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4965 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6246
 schedule+0xd2/0x260 kernel/sched/core.c:6319
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6378
 __mutex_lock_common kernel/locking/mutex.c:672 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:732
 addrconf_dad_work+0xa3/0x1340 net/ipv6/addrconf.c:4047
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task syz-executor.2:3355 can't die for more than 143 seconds.
task:syz-executor.2  state:D stack:24720 pid: 3355 ppid:  6576 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4965 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6246
 schedule+0xd2/0x260 kernel/sched/core.c:6319
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 dev_deactivate_many+0x710/0xc60 net/sched/sch_generic.c:1302
 __dev_close_many+0x133/0x2e0 net/core/dev.c:1561
 __dev_close net/core/dev.c:1586 [inline]
 __dev_change_flags+0x2ca/0x750 net/core/dev.c:8783
 dev_change_flags+0x93/0x170 net/core/dev.c:8856
 do_setlink+0x96d/0x3970 net/core/rtnetlink.c:2719
 __rtnl_newlink+0xde6/0x1750 net/core/rtnetlink.c:3391
 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3506
 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5572
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2491
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fec8e31da39
RSP: 002b:00007fec8b893188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fec8e420f60 RCX: 00007fec8e31da39
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007fec8e377c5f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff696d912f R14: 00007fec8b893300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8bb835a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
3 locks held by in:imklog/6247:
 #0: ffff88807e94aff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
 #1: ffffffff8bb729e8 (syslog_lock){+.+.}-{3:3}, at: is_bpf_text_address+0x0/0x170 kernel/bpf/core.c:694
 #2: ffff8880b9c279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3a6/0x490 kernel/sched/psi.c:880
3 locks held by kworker/0:6/18599:
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline]
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2268
 #1: ffffc90002937db0 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2272
 #2: ffffffff8d2fcb68 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4590
3 locks held by kworker/1:1/27882:
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline]
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
 #0: ffff88814ac0d938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2268
 #1: ffffc90002b87db0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2272
 #2: ffffffff8d2fcb68 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xa3/0x1340 net/ipv6/addrconf.c:4047
1 lock held by syz-executor.2/3355:
 #0: ffffffff8d2fcb68 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d2fcb68 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3be/0xb80 net/core/rtnetlink.c:5569

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc6-next-20211020-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:254 [inline]
 watchdog+0xcb7/0xed0 kernel/hung_task.c:339
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2965 Comm: systemd-journal Not tainted 5.15.0-rc6-next-20211020-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_kcov_mode+0x22/0x40 kernel/kcov.c:166
Code: cc cc cc cc cc cc cc cc 65 8b 05 39 ff 8a 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 ac 15 00 00 <85> d2 74 0b 8b 86 88 15 00 00 39 f8 0f 94 c0 c3 66 66 2e 0f 1f 84
RSP: 0018:ffffc90000007c28 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff88807bbe6140 RCX: ffff88807b379d00
RDX: 0000000000000000 RSI: ffff88807b379d00 RDI: 0000000000000003
RBP: ffff88801c6c0d60 R08: 0000000000000000 R09: 0000000000000080
R10: ffffffff889b3b97 R11: 0000000000000050 R12: ffff888079f52850
R13: 0000000000000080 R14: 0000000000000080 R15: ffff88801c6c0d60
FS:  00007f41c81e68c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f41c5859000 CR3: 000000001a228000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 write_comp_data kernel/kcov.c:221 [inline]
 __sanitizer_cov_trace_const_cmp2+0x22/0x80 kernel/kcov.c:280
 ieee80211_scan_rx+0x87/0x7e0 net/mac80211/scan.c:261
 __ieee80211_rx_handle_packet net/mac80211/rx.c:4777 [inline]
 ieee80211_rx_list+0x20fc/0x27d0 net/mac80211/rx.c:4969
 ieee80211_rx_napi+0xdb/0x3d0 net/mac80211/rx.c:4992
 ieee80211_rx include/net/mac80211.h:4582 [inline]
 ieee80211_tasklet_handler+0xd4/0x130 net/mac80211/main.c:235
 tasklet_action_common.constprop.0+0x201/0x2e0 kernel/softirq.c:784
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:unwind_next_frame+0x48f/0x1ca0 arch/x86/kernel/unwind_orc.c:464
Code: b6 04 02 84 c0 74 08 3c 03 0f 8e 4b 11 00 00 41 c7 06 00 00 00 00 31 c0 e9 04 fc ff ff 48 ba 00 00 00 00 00 fc ff df 4c 89 f9 <48> c1 e9 03 0f b6 34 11 49 8d 4f 01 48 89 cf 48 c1 ef 03 0f b6 14
RSP: 0018:ffffc90001f878b0 EFLAGS: 00000206
RAX: 0000000000000005 RBX: 1ffff920003f0f1e RCX: ffffffff8e164a4c
RDX: dffffc0000000000 RSI: ffffffff8e16499a RDI: ffffffff8da478ec
RBP: 0000000000000001 R08: ffffffff8e164a48 R09: 0000000000000001
R10: fffff520003f0f3e R11: 0000000000088089 R12: ffffc90001f879e0
R13: ffffc90001f879c9 R14: ffffc90001f87988 R15: ffffffff8e164a4c
 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:1700 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1726
 slab_free mm/slub.c:3491 [inline]
 kfree+0xf6/0x560 mm/slub.c:4539
 security_cred_free+0xc3/0x130 security/security.c:1685
 put_cred_rcu+0x122/0x520 kernel/cred.c:115
 __put_cred+0x1de/0x250 kernel/cred.c:151
 put_cred include/linux/cred.h:288 [inline]
 put_cred include/linux/cred.h:281 [inline]
 revert_creds+0x1a8/0x1f0 kernel/cred.c:610
 do_faccessat+0x2e7/0x850 fs/open.c:462
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f41c74a19c7
Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffcc634c688 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffcc634f5a0 RCX: 00007f41c74a19c7
RDX: 00007f41c7f12a00 RSI: 0000000000000000 RDI: 0000562a2bc569a3
RBP: 00007ffcc634c6c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffcc634f5a0 R15: 00007ffcc634cbb0
 </TASK>
----------------
Code disassembly (best guess):
   0:	cc                   	int3
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	65 8b 05 39 ff 8a 7e 	mov    %gs:0x7e8aff39(%rip),%eax        # 0x7e8aff48
   f:	89 c2                	mov    %eax,%edx
  11:	81 e2 00 01 00 00    	and    $0x100,%edx
  17:	a9 00 01 ff 00       	test   $0xff0100,%eax
  1c:	74 10                	je     0x2e
  1e:	31 c0                	xor    %eax,%eax
  20:	85 d2                	test   %edx,%edx
  22:	74 15                	je     0x39
  24:	8b 96 ac 15 00 00    	mov    0x15ac(%rsi),%edx
* 2a:	85 d2                	test   %edx,%edx <-- trapping instruction
  2c:	74 0b                	je     0x39
  2e:	8b 86 88 15 00 00    	mov    0x1588(%rsi),%eax
  34:	39 f8                	cmp    %edi,%eax
  36:	0f 94 c0             	sete   %al
  39:	c3                   	retq
  3a:	66                   	data16
  3b:	66                   	data16
  3c:	2e                   	cs
  3d:	0f                   	.byte 0xf
  3e:	1f                   	(bad)
  3f:	84                   	.byte 0x84