syzbot

INFO: task kworker/1:0:20 blocked for more than 143 seconds.
      Not tainted 5.15.0-rc5-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0     state:D stack:26600 pid:   20 ppid:     2 flags:0x00004000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 context_switch kernel/sched/core.c:4940 [inline]
 __schedule+0xb44/0x5960 kernel/sched/core.c:6287
 schedule+0xd3/0x270 kernel/sched/core.c:6366
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425
 __mutex_lock_common kernel/locking/mutex.c:669 [inline]
 __mutex_lock+0xa34/0x12f0 kernel/locking/mutex.c:729
 addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4590
 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Showing all locks held in the system:
3 locks held by kworker/1:0/20:
 #0: ffff888025c53938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888025c53938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888025c53938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline]
 #0: ffff888025c53938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline]
 #0: ffff888025c53938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline]
 #0: ffff888025c53938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x8a3/0x16b0 kernel/workqueue.c:2268
 #1: ffffc90000da7db0 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8d7/0x16b0 kernel/workqueue.c:2272
 #2: ffffffff8d0e90e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4590
1 lock held by khungtaskd/26:
 #0: ffffffff8b981ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446
1 lock held by syz-executor683/4974:
 #0: ffffffff8d0e90e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8d0e90e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3be/0xb80 net/core/rtnetlink.c:5569

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

NMI backtrace for cpu 0
CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __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:210 [inline]
 watchdog+0xc1d/0xf50 kernel/hung_task.c:295
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 22172 Comm: kworker/u4:1 Not tainted 5.15.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:kasan_check_range+0x13d/0x180 mm/kasan/generic.c:190
Code: c2 e9 55 ff ff ff 49 39 d2 75 17 49 0f be 02 41 83 e1 07 49 39 c1 7d 0a 5b b8 01 00 00 00 5d 41 5c c3 44 89 c2 e8 73 f0 ff ff <5b> 83 f0 01 5d 41 5c c3 48 29 c3 48 89 da 49 89 d3 49 c1 fb 3f 49
RSP: 0018:ffffc90006aef9c0 EFLAGS: 00000086
RAX: 0000000000000000 RBX: ffffffff8d6ee34c RCX: ffffffff812a7c7d
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 00002aaaaaaab1b9
RBP: ffffffff8eeeb369 R08: 0000000000000001 R09: 00002aaaaaaab1ba
R10: fffffbfff1ddd66d R11: 000000000000003f R12: 0000000000000001
R13: 00002aaaaaaab1b9 R14: 00000000000001ba R15: ffffffff8baac4e0
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5e6c69e000 CR3: 00000001400d1000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 memcpy+0x39/0x60 mm/kasan/shadow.c:66
 memcpy include/linux/fortify-string.h:191 [inline]
 __text_poke+0x48d/0x8c0 arch/x86/kernel/alternative.c:841
 text_poke_bp_batch+0x3d7/0x560 arch/x86/kernel/alternative.c:1178
 text_poke_flush arch/x86/kernel/alternative.c:1268 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:1265 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1275
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x1d5/0x430 kernel/jump_label.c:830
 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177
 static_key_enable+0x16/0x20 kernel/jump_label.c:190
 toggle_allocation_gate mm/kfence/core.c:626 [inline]
 toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:618
 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	e9 55 ff ff ff       	jmpq   0xffffff5a
   5:	49 39 d2             	cmp    %rdx,%r10
   8:	75 17                	jne    0x21
   a:	49 0f be 02          	movsbq (%r10),%rax
   e:	41 83 e1 07          	and    $0x7,%r9d
  12:	49 39 c1             	cmp    %rax,%r9
  15:	7d 0a                	jge    0x21
  17:	5b                   	pop    %rbx
  18:	b8 01 00 00 00       	mov    $0x1,%eax
  1d:	5d                   	pop    %rbp
  1e:	41 5c                	pop    %r12
  20:	c3                   	retq
  21:	44 89 c2             	mov    %r8d,%edx
  24:	e8 73 f0 ff ff       	callq  0xfffff09c
* 29:	5b                   	pop    %rbx <-- trapping instruction
  2a:	83 f0 01             	xor    $0x1,%eax
  2d:	5d                   	pop    %rbp
  2e:	41 5c                	pop    %r12
  30:	c3                   	retq
  31:	48 29 c3             	sub    %rax,%rbx
  34:	48 89 da             	mov    %rbx,%rdx
  37:	49 89 d3             	mov    %rdx,%r11
  3a:	49 c1 fb 3f          	sar    $0x3f,%r11
  3e:	49                   	rex.WB