------------[ cut here ]------------ workqueue: work disable count underflowed WARNING: kernel/workqueue.c:4359 at work_offqd_enable kernel/workqueue.c:4359 [inline], CPU#1: syz.7.377/7914 WARNING: kernel/workqueue.c:4359 at enable_work+0x1b3/0x220 kernel/workqueue.c:4530, CPU#1: syz.7.377/7914 Modules linked in: CPU: 1 UID: 0 PID: 7914 Comm: syz.7.377 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:work_offqd_enable kernel/workqueue.c:4359 [inline] RIP: 0010:enable_work+0x1b3/0x220 kernel/workqueue.c:4530 Code: 13 41 36 00 4d 85 f6 75 48 e8 09 41 36 00 eb 47 e8 02 41 36 00 90 0f 0b 90 e9 d0 fe ff ff e8 f4 40 36 00 48 8d 3d 3d 57 fa 0d <67> 48 0f b9 3a e9 e6 fe ff ff e8 de 40 36 00 90 0f 0b 90 e9 1a ff RSP: 0018:ffffc900043bfbb0 EFLAGS: 00010093 RAX: ffffffff818ab6cc RBX: 0000000000000000 RCX: ffff8880313a1e80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8f850e10 RBP: 0000000000000000 R08: ffff88807e710e77 R09: 1ffff1100fce21ce R10: dffffc0000000000 R11: ffffed100fce21cf R12: 1ffff1100fce21ce R13: 001fffffffc00001 R14: ffff88807e710e70 R15: dffffc0000000000 FS: 000055556c5b1500(0000) GS:ffff888125f1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffff CR3: 000000007dd95000 CR4: 0000000000350ef0 Call Trace: __cancel_work_sync+0xf7/0x110 kernel/workqueue.c:4400 lec_arp_destroy net/atm/lec.c:1475 [inline] lec_atm_close+0x172/0xae0 net/atm/lec.c:479 vcc_destroy_socket net/atm/common.c:181 [inline] vcc_release+0x10f/0x580 net/atm/common.c:205 svc_release+0x6c/0xe0 net/atm/svc.c:95 __sock_release net/socket.c:662 [inline] sock_close+0xc3/0x240 net/socket.c:1455 __fput+0x44c/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f32e298f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc6cc1c388 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 000000000004a988 RCX: 00007f32e298f749 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f32e2be7da0 R08: 0000000000000001 R09: 000000086cc1c67f R10: 0000001b2f220000 R11: 0000000000000246 R12: 00007f32e2be618c R13: 00007f32e2be6180 R14: ffffffffffffffff R15: 00007ffc6cc1c4a0 ---------------- Code disassembly (best guess): 0: 13 41 36 adc 0x36(%rcx),%eax 3: 00 4d 85 add %cl,-0x7b(%rbp) 6: f6 75 48 divb 0x48(%rbp) 9: e8 09 41 36 00 call 0x364117 e: eb 47 jmp 0x57 10: e8 02 41 36 00 call 0x364117 15: 90 nop 16: 0f 0b ud2 18: 90 nop 19: e9 d0 fe ff ff jmp 0xfffffeee 1e: e8 f4 40 36 00 call 0x364117 23: 48 8d 3d 3d 57 fa 0d lea 0xdfa573d(%rip),%rdi # 0xdfa5767 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 e6 fe ff ff jmp 0xffffff1a 34: e8 de 40 36 00 call 0x364117 39: 90 nop 3a: 0f 0b ud2 3c: 90 nop 3d: e9 .byte 0xe9 3e: 1a ff sbb %bh,%bh