==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:930 [inline]
BUG: KASAN: use-after-free in enqueue_timer+0xae/0x480 kernel/time/timer.c:611
Write of size 8 at addr ffff88811eca0a00 by task kworker/u4:3/308

CPU: 0 PID: 308 Comm: kworker/u4:3 Tainted: G        W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events_unbound flush_to_ldisc
Call Trace:
 <IRQ>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report_generic.c:356
 hlist_add_head include/linux/list.h:930 [inline]
 enqueue_timer+0xae/0x480 kernel/time/timer.c:611
 internal_add_timer kernel/time/timer.c:640 [inline]
 __mod_timer+0x859/0xc00 kernel/time/timer.c:1137
 mod_timer+0x1f/0x30 kernel/time/timer.c:1196
 igmp_ifc_start_timer net/ipv4/igmp.c:243 [inline]
 igmp_ifc_timer_expire+0xb2a/0xe40 net/ipv4/igmp.c:822
 call_timer_fn+0x46/0x2a0 kernel/time/timer.c:1553
 expire_timers kernel/time/timer.c:1604 [inline]
 __run_timers+0x646/0x9b0 kernel/time/timer.c:1875
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1888
 handle_softirqs+0x1d7/0x600 kernel/softirq.c:642
 __do_softirq kernel/softirq.c:680 [inline]
 invoke_softirq kernel/softirq.c:497 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x73/0x2a0 mm/kasan/generic.c:189
Code: 49 ba 00 00 00 00 00 fc ff df 4f 8d 1c 16 4c 8d 44 3e ff 4d 89 c1 49 c1 e9 03 4b 8d 1c 29 49 89 dc 4d 29 dc 49 83 fc 10 7f 29 <4d> 85 e4 0f 84 45 01 00 00 4c 89 cb 48 f7 d3 4c 01 f3 41 80 3b 00
RSP: 0018:ffffc9000dc6f758 EFLAGS: 00000283
RAX: f3f3f3f8f1f1f101 RBX: fffff52001b8def9 RCX: ffffffff8500456f
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc9000dc6f7c0
RBP: ffffc9000dc6f780 R08: ffffc9000dc6f7c7 R09: 1ffff92001b8def8
R10: dffffc0000000000 R11: fffff52001b8def8 R12: 0000000000000001
R13: dffffc0000000001 R14: 1ffff92001b8def8 R15: ffffc9000dc6f7c0
 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_long_try_cmpxchg_release include/linux/atomic/atomic-instrumented.h:1789 [inline]
 __mutex_unlock_fast kernel/locking/mutex.c:188 [inline]
 mutex_unlock+0x8f/0x230 kernel/locking/mutex.c:560
 commit_echoes drivers/tty/n_tty.c:777 [inline]
 n_tty_receive_char+0x74f/0xc50 drivers/tty/n_tty.c:1420
 n_tty_receive_buf_standard+0x618/0x5260 drivers/tty/n_tty.c:1589
 __receive_buf drivers/tty/n_tty.c:1623 [inline]
 n_tty_receive_buf_common+0xb44/0x1340 drivers/tty/n_tty.c:1721
 n_tty_receive_buf2+0x31/0x40 drivers/tty/n_tty.c:1767
 tty_ldisc_receive_buf+0xb5/0x180 drivers/tty/tty_buffer.c:457
 tty_port_default_receive_buf+0x6d/0xa0 drivers/tty/tty_port.c:39
 receive_buf drivers/tty/tty_buffer.c:515 [inline]
 flush_to_ldisc+0x2e1/0x820 drivers/tty/tty_buffer.c:565
 process_one_work+0x717/0xc30 kernel/workqueue.c:2302
 process_scheduled_works kernel/workqueue.c:2365 [inline]
 worker_thread+0xcc2/0x11d0 kernel/workqueue.c:2451
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Allocated by task 8687:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc+0xb4/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 hci_alloc_dev_priv+0x27/0x1bd0 net/bluetooth/hci_core.c:2433
 hci_alloc_dev include/net/bluetooth/hci_core.h:1523 [inline]
 hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:669 [inline]
 hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:754 [inline]
 hci_uart_tty_ioctl+0x3c4/0xa70 drivers/bluetooth/hci_ldisc.c:809
 tty_ioctl+0x8ef/0xc60 drivers/tty/tty_io.c:2785
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 8692:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1750 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
 slab_free mm/slub.c:3712 [inline]
 __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
 kfree+0x6f/0xf0 mm/slab_common.c:990
 hci_release_dev+0x12a3/0x13b0 net/bluetooth/hci_core.c:2761
 bt_host_release+0x82/0x90 net/bluetooth/hci_sysfs.c:85
 device_release+0xa4/0x1d0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:681 [inline]
 kobject_release lib/kobject.c:712 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x19d/0x280 lib/kobject.c:729
 put_device+0x1f/0x30 drivers/base/core.c:3806
 hci_dev_put include/net/bluetooth/hci_core.h:1483 [inline]
 hci_dev_cmd+0x279/0x740 net/bluetooth/hci_core.c:795
 hci_sock_ioctl+0x41e/0x7f0 net/bluetooth/hci_sock.c:1096
 sock_do_ioctl+0x114/0x330 net/socket.c:1192
 sock_ioctl+0x475/0x700 net/socket.c:1311
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
 insert_work+0x51/0x300 kernel/workqueue.c:1368
 __queue_work+0x9d0/0xd50 kernel/workqueue.c:1527
 queue_work_on+0xde/0x150 kernel/workqueue.c:1555
 queue_work include/linux/workqueue.h:510 [inline]
 hci_cmd_sync_run net/bluetooth/hci_sync.c:140 [inline]
 __hci_cmd_sync_sk+0xaa8/0xd80 net/bluetooth/hci_sync.c:162
 __hci_cmd_sync_status_sk net/bluetooth/hci_sync.c:253 [inline]
 __hci_cmd_sync_status net/bluetooth/hci_sync.c:277 [inline]
 hci_cmd_sync_status+0x53/0x120 net/bluetooth/hci_sync.c:288
 hci_dev_cmd+0x642/0x740 net/bluetooth/hci_core.c:-1
 hci_sock_ioctl+0x41e/0x7f0 net/bluetooth/hci_sock.c:1096
 sock_do_ioctl+0x114/0x330 net/socket.c:1192
 sock_ioctl+0x475/0x700 net/socket.c:1311
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Second to last potentially related work creation:
 kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
 insert_work+0x51/0x300 kernel/workqueue.c:1368
 __queue_work+0x9d0/0xd50 kernel/workqueue.c:1527
 queue_work_on+0xde/0x150 kernel/workqueue.c:1555
 queue_work include/linux/workqueue.h:510 [inline]
 hci_cmd_timeout+0x191/0x200 net/bluetooth/hci_core.c:1468
 process_one_work+0x717/0xc30 kernel/workqueue.c:2302
 worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff88811eca0000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 2560 bytes inside of
 8192-byte region [ffff88811eca0000, ffff88811eca2000)

The buggy address belongs to the physical page:
page:ffffea00047b2800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11eca0
head:ffffea00047b2800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000001 ffff888100043500
raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 4561, tgid 4560 (syz.8.1276), ts 289312809685, free_ts 289287687210
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2673
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2680
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4587
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5931
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
 kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028
 kmalloc include/linux/slab.h:563 [inline]
 audit_log_d_path+0xc6/0x240 kernel/audit.c:2155
 dump_common_audit_data security/lsm_audit.c:223 [inline]
 common_lsm_audit+0x1de/0x1730 security/lsm_audit.c:457
 slow_avc_audit+0x1c4/0x240 security/selinux/avc.c:804
 avc_audit security/selinux/include/avc.h:136 [inline]
 avc_has_perm+0x1fb/0x250 security/selinux/avc.c:1201
 inode_has_perm security/selinux/hooks.c:1638 [inline]
 path_has_perm security/selinux/hooks.c:1671 [inline]
 selinux_path_notify+0x4ff/0x660 security/selinux/hooks.c:3392
 security_path_notify+0x83/0xb0 security/security.c:1036
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1581 [inline]
 free_pcp_prepare mm/page_alloc.c:1655 [inline]
 free_unref_page_prepare+0x81b/0x820 mm/page_alloc.c:3622
 free_unref_page+0x93/0x530 mm/page_alloc.c:3720
 free_the_page mm/page_alloc.c:863 [inline]
 __free_pages+0x67/0x100 mm/page_alloc.c:6021
 __free_slab+0xc7/0x1a0 mm/slub.c:2044
 free_slab mm/slub.c:2059 [inline]
 discard_slab mm/slub.c:2065 [inline]
 __unfreeze_partials+0x15a/0x190 mm/slub.c:2614
 put_cpu_partial+0xa9/0x100 mm/slub.c:2690
 __slab_free+0x1c4/0x280 mm/slub.c:3589
 do_slab_free mm/slub.c:3666 [inline]
 ___cache_free+0xbf/0xd0 mm/slub.c:3722
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:311
 kasan_slab_alloc include/linux/kasan.h:202 [inline]
 slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768
 slab_alloc_node mm/slub.c:3382 [inline]
 slab_alloc mm/slub.c:3392 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3399 [inline]
 kmem_cache_alloc+0x166/0x320 mm/slub.c:3408
 getname_flags+0xba/0x510 fs/namei.c:139
 vfs_fstatat fs/stat.c:266 [inline]
 __do_sys_newfstatat fs/stat.c:437 [inline]
 __se_sys_newfstatat+0x127/0x440 fs/stat.c:431
 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:431

Memory state around the buggy address:
 ffff88811eca0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811eca0980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88811eca0a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88811eca0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811eca0b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 308 Comm: kworker/u4:3 Tainted: G    B   W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events_unbound flush_to_ldisc
RIP: 0010:__queue_work+0x582/0xd50 kernel/workqueue.c:-1
Code: b4 00 00 00 e8 7f 56 29 00 48 bb 00 00 00 00 00 fc ff df 4c 89 ef e8 7d 6a b9 03 4c 8b 65 d0 4c 8b 6d c0 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 70 e1 6e 00 49 8b 3e e8 18 66 b9 03
RSP: 0018:ffffc90000007c78 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88810fd50000
RDX: 0000000000000100 RSI: 000000007fffffff RDI: 000000007fffffff
RBP: ffffc90000007d08 R08: 0000000000000007 R09: 00000000fffffffb
R10: dffffc0000000000 R11: ffffed1023d94139 R12: ffff88811eca09c8
R13: ffff88811dc0e800 R14: 0000000000000000 R15: 000000007fffffff
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3e91beb840 CR3: 0000000159497000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 delayed_work_timer_fn+0x61/0x80 kernel/workqueue.c:1653
 call_timer_fn+0x46/0x2a0 kernel/time/timer.c:1553
 expire_timers kernel/time/timer.c:1599 [inline]
 __run_timers+0x672/0x9b0 kernel/time/timer.c:1875
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1888
 handle_softirqs+0x1d7/0x600 kernel/softirq.c:642
 __do_softirq kernel/softirq.c:680 [inline]
 invoke_softirq kernel/softirq.c:497 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:84 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x73/0x2a0 mm/kasan/generic.c:189
Code: 49 ba 00 00 00 00 00 fc ff df 4f 8d 1c 16 4c 8d 44 3e ff 4d 89 c1 49 c1 e9 03 4b 8d 1c 29 49 89 dc 4d 29 dc 49 83 fc 10 7f 29 <4d> 85 e4 0f 84 45 01 00 00 4c 89 cb 48 f7 d3 4c 01 f3 41 80 3b 00
RSP: 0018:ffffc9000dc6f758 EFLAGS: 00000283
RAX: f3f3f3f8f1f1f101 RBX: fffff52001b8def9 RCX: ffffffff8500456f
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc9000dc6f7c0
RBP: ffffc9000dc6f780 R08: ffffc9000dc6f7c7 R09: 1ffff92001b8def8
R10: dffffc0000000000 R11: fffff52001b8def8 R12: 0000000000000001
R13: dffffc0000000001 R14: 1ffff92001b8def8 R15: ffffc9000dc6f7c0
 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_long_try_cmpxchg_release include/linux/atomic/atomic-instrumented.h:1789 [inline]
 __mutex_unlock_fast kernel/locking/mutex.c:188 [inline]
 mutex_unlock+0x8f/0x230 kernel/locking/mutex.c:560
 commit_echoes drivers/tty/n_tty.c:777 [inline]
 n_tty_receive_char+0x74f/0xc50 drivers/tty/n_tty.c:1420
 n_tty_receive_buf_standard+0x618/0x5260 drivers/tty/n_tty.c:1589
 __receive_buf drivers/tty/n_tty.c:1623 [inline]
 n_tty_receive_buf_common+0xb44/0x1340 drivers/tty/n_tty.c:1721
 n_tty_receive_buf2+0x31/0x40 drivers/tty/n_tty.c:1767
 tty_ldisc_receive_buf+0xb5/0x180 drivers/tty/tty_buffer.c:457
 tty_port_default_receive_buf+0x6d/0xa0 drivers/tty/tty_port.c:39
 receive_buf drivers/tty/tty_buffer.c:515 [inline]
 flush_to_ldisc+0x2e1/0x820 drivers/tty/tty_buffer.c:565
 process_one_work+0x717/0xc30 kernel/workqueue.c:2302
 process_scheduled_works kernel/workqueue.c:2365 [inline]
 worker_thread+0xcc2/0x11d0 kernel/workqueue.c:2451
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__queue_work+0x582/0xd50 kernel/workqueue.c:-1
Code: b4 00 00 00 e8 7f 56 29 00 48 bb 00 00 00 00 00 fc ff df 4c 89 ef e8 7d 6a b9 03 4c 8b 65 d0 4c 8b 6d c0 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 70 e1 6e 00 49 8b 3e e8 18 66 b9 03
RSP: 0018:ffffc90000007c78 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88810fd50000
RDX: 0000000000000100 RSI: 000000007fffffff RDI: 000000007fffffff
RBP: ffffc90000007d08 R08: 0000000000000007 R09: 00000000fffffffb
R10: dffffc0000000000 R11: ffffed1023d94139 R12: ffff88811eca09c8
R13: ffff88811dc0e800 R14: 0000000000000000 R15: 000000007fffffff
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3e91beb840 CR3: 0000000159497000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	49 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%r10
   7:	fc ff df
   a:	4f 8d 1c 16          	lea    (%r14,%r10,1),%r11
   e:	4c 8d 44 3e ff       	lea    -0x1(%rsi,%rdi,1),%r8
  13:	4d 89 c1             	mov    %r8,%r9
  16:	49 c1 e9 03          	shr    $0x3,%r9
  1a:	4b 8d 1c 29          	lea    (%r9,%r13,1),%rbx
  1e:	49 89 dc             	mov    %rbx,%r12
  21:	4d 29 dc             	sub    %r11,%r12
  24:	49 83 fc 10          	cmp    $0x10,%r12
  28:	7f 29                	jg     0x53
* 2a:	4d 85 e4             	test   %r12,%r12 <-- trapping instruction
  2d:	0f 84 45 01 00 00    	je     0x178
  33:	4c 89 cb             	mov    %r9,%rbx
  36:	48 f7 d3             	not    %rbx
  39:	4c 01 f3             	add    %r14,%rbx
  3c:	41 80 3b 00          	cmpb   $0x0,(%r11)