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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9ddd79d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 00000000400455c8 RDI: 0000000000000003 RBP: 00007f9ddd79d1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd7e60752f R14: 00007f9ddd79d300 R15: 0000000000022000 general protection fault, probably for non-canonical address 0xdffffc0000000023: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000118-0x000000000000011f] CPU: 1 PID: 13906 Comm: syz-executor.1 Not tainted 5.14.0-rc6-next-20210818-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:workqueue_sysfs_unregister kernel/workqueue.c:5762 [inline] RIP: 0010:destroy_workqueue+0x2e/0x810 kernel/workqueue.c:4416 Code: 49 89 fe 41 55 41 54 55 53 48 83 ec 18 e8 0a c4 29 00 49 8d be 18 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 39 07 00 00 49 8b 9e 18 01 00 00 48 85 db 74 19 RSP: 0018:ffffc9000232fb38 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffffc9000636a000 RDX: 0000000000000023 RSI: ffffffff814ca2f6 RDI: 0000000000000118 RBP: ffff88808de91340 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81a45a98 R11: 0000000000000000 R12: ffff88808de90000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f9ddd79d700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe65aedc38 CR3: 00000000899fc000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hci_release_dev+0x125/0xb70 net/bluetooth/hci_core.c:4055 bt_host_release+0x15/0x20 net/bluetooth/hci_sysfs.c:86 device_release+0xa3/0x240 drivers/base/core.c:2195 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1d0/0x540 lib/kobject.c:753 put_device+0x1b/0x30 drivers/base/core.c:3466 hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:675 [inline] hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:706 [inline] hci_uart_tty_ioctl+0x9cb/0xc50 drivers/bluetooth/hci_ldisc.c:760 tty_ioctl+0xef9/0x1600 drivers/tty/tty_io.c:2814 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x19b/0x210 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9ddd79d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 00000000400455c8 RDI: 0000000000000003 RBP: 00007f9ddd79d1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd7e60752f R14: 00007f9ddd79d300 R15: 0000000000022000 Modules linked in: ---[ end trace 3f999463a7840f80 ]--- RIP: 0010:workqueue_sysfs_unregister kernel/workqueue.c:5762 [inline] RIP: 0010:destroy_workqueue+0x2e/0x810 kernel/workqueue.c:4416 Code: 49 89 fe 41 55 41 54 55 53 48 83 ec 18 e8 0a c4 29 00 49 8d be 18 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 39 07 00 00 49 8b 9e 18 01 00 00 48 85 db 74 19 RSP: 0018:ffffc9000232fb38 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffffc9000636a000 RDX: 0000000000000023 RSI: ffffffff814ca2f6 RDI: 0000000000000118 RBP: ffff88808de91340 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81a45a98 R11: 0000000000000000 R12: ffff88808de90000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f9ddd79d700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000005451f8 CR3: 00000000899fc000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 40 00 nopl 0x0(%rax) 10: 48 89 f8 mov %rdi,%rax 13: 48 89 f7 mov %rsi,%rdi 16: 48 89 d6 mov %rdx,%rsi 19: 48 89 ca mov %rcx,%rdx 1c: 4d 89 c2 mov %r8,%r10 1f: 4d 89 c8 mov %r9,%r8 22: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 27: 0f 05 syscall 29: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 2f: 73 01 jae 0x32 31: c3 retq 32: 48 c7 c1 bc ff ff ff mov $0xffffffffffffffbc,%rcx 39: f7 d8 neg %eax 3b: 64 89 01 mov %eax,%fs:(%rcx) 3e: 48 rex.W