Hello, syzbot found the following issue on: HEAD commit: 6c8f479764eb Add linux-next specific files for 20220809 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=1193703d080000 kernel config: https://syzkaller.appspot.com/x/.config?x=a5ae8cfa8d7075d1 dashboard link: https://syzkaller.appspot.com/bug?extid=83672956c7aa6af698b3 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12b620f3080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=127b1a0d080000 Bisection is inconclusive: the issue happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12371a0d080000 final oops: https://syzkaller.appspot.com/x/report.txt?x=11371a0d080000 console output: https://syzkaller.appspot.com/x/log.txt?x=16371a0d080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+83672956c7aa6af698b3@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object type: timer_list hint: 0x0 WARNING: CPU: 0 PID: 3607 at lib/debugobjects.c:509 debug_print_object+0x16e/0x250 lib/debugobjects.c:509 Modules linked in: CPU: 0 PID: 3607 Comm: syz-executor235 Not tainted 5.19.0-next-20220809-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:509 Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd 60 09 49 8a 4c 89 ee 48 c7 c7 00 fd 48 8a e8 73 ac 38 05 <0f> 0b 83 05 35 41 dd 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffc900039ef8a0 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000000 RDX: ffff88807f355880 RSI: ffffffff8161f1f8 RDI: fffff5200073df06 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89eeff60 R13: ffffffff8a4903c0 R14: ffffffff816b23c0 R15: 1ffff9200073df1f FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff196b876a8 CR3: 00000000261c8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> debug_object_assert_init lib/debugobjects.c:899 [inline] debug_object_assert_init+0x1f4/0x2e0 lib/debugobjects.c:870 debug_timer_assert_init kernel/time/timer.c:792 [inline] debug_assert_init kernel/time/timer.c:837 [inline] del_timer+0x6d/0x110 kernel/time/timer.c:1257 try_to_grab_pending+0x6d/0xd0 kernel/workqueue.c:1275 __cancel_work+0x7c/0x340 kernel/workqueue.c:3250 l2cap_clear_timer include/net/bluetooth/l2cap.h:884 [inline] l2cap_chan_del+0x565/0xa60 net/bluetooth/l2cap_core.c:688 l2cap_conn_del+0x3c0/0x7b0 net/bluetooth/l2cap_core.c:1922 l2cap_disconn_cfm net/bluetooth/l2cap_core.c:8213 [inline] l2cap_disconn_cfm+0x8c/0xc0 net/bluetooth/l2cap_core.c:8206 hci_disconn_cfm include/net/bluetooth/hci_core.h:1779 [inline] hci_conn_hash_flush+0x122/0x260 net/bluetooth/hci_conn.c:2366 hci_dev_close_sync+0x55d/0x1130 net/bluetooth/hci_sync.c:4476 hci_dev_do_close+0x2d/0x70 net/bluetooth/hci_core.c:554 hci_unregister_dev+0x17f/0x4e0 net/bluetooth/hci_core.c:2682 vhci_release+0x7c/0xf0 drivers/bluetooth/hci_vhci.c:568 __fput+0x277/0x9d0 fs/file_table.c:320 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xc39/0x2b60 kernel/exit.c:813 do_group_exit+0xd0/0x2a0 kernel/exit.c:943 __do_sys_exit_group kernel/exit.c:954 [inline] __se_sys_exit_group kernel/exit.c:952 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:952 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+0x63/0xcd RIP: 0033:0x7fbef442f629 Code: Unable to access opcode bytes at RIP 0x7fbef442f5ff. RSP: 002b:00007ffc6284d478 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fbef44ba390 RCX: 00007fbef442f629 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffffffffffb8 R09: 000000fff44b4e00 R10: 0000000000000004 R11: 0000000000000246 R12: 00007fbef44ba390 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
