Hello, syzbot found the following issue on: HEAD commit: 5a4cee98ea75 Add linux-next specific files for 20210728 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=146e451e300000 kernel config: https://syzkaller.appspot.com/x/.config?x=143f7094479da395 dashboard link: https://syzkaller.appspot.com/bug?extid=47c6d0efbb7fe2f7a5b8 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=118c3162300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10500872300000 The issue was bisected to: commit 73333364afebb5e45807139bc79e6a6574c1874b Author: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx> Date: Mon Jul 26 21:12:04 2021 +0000 Bluetooth: defer cleanup of resources in hci_unregister_dev() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=169b6346300000 final oops: https://syzkaller.appspot.com/x/report.txt?x=159b6346300000 console output: https://syzkaller.appspot.com/x/log.txt?x=119b6346300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+47c6d0efbb7fe2f7a5b8@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 73333364afeb ("Bluetooth: defer cleanup of resources in hci_unregister_dev()") 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: 8467 Comm: syz-executor744 Not tainted 5.14.0-rc3-next-20210728-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:workqueue_sysfs_unregister kernel/workqueue.c:5732 [inline] RIP: 0010:destroy_workqueue+0x2e/0x800 kernel/workqueue.c:4386 Code: 49 89 fe 41 55 41 54 55 53 48 83 ec 08 e8 aa 5c 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 2e 07 00 00 49 8b 9e 18 01 00 00 48 85 db 74 19 RSP: 0018:ffffc90009577a98 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000023 RSI: ffffffff814c5bc6 RDI: 0000000000000118 RBP: ffff8880131ad340 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81a39748 R11: 0000000000000000 R12: ffff8880131ac000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000480da8 CR3: 000000000b68e000 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:4048 bt_host_release+0x15/0x20 net/bluetooth/hci_sysfs.c:86 device_release+0x9f/0x240 drivers/base/core.c:2193 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 put_device+0x1b/0x30 drivers/base/core.c:3463 hci_uart_tty_close+0x1e4/0x2a0 drivers/bluetooth/hci_ldisc.c:546 tty_ldisc_close+0x110/0x190 drivers/tty/tty_ldisc.c:474 tty_ldisc_kill+0x94/0x150 drivers/tty/tty_ldisc.c:629 tty_ldisc_release+0xe3/0x2a0 drivers/tty/tty_ldisc.c:803 tty_release_struct+0x20/0xe0 drivers/tty/tty_io.c:1706 tty_release+0xc70/0x1200 drivers/tty/tty_io.c:1878 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xbd4/0x2a60 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 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+0x44/0xae RIP: 0033:0x43da49 Code: Unable to access opcode bytes at RIP 0x43da1f. RSP: 002b:00007ffc6bba0fb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043da49 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000400488 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ae230 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 Modules linked in: ---[ end trace 516dd52cdf23e662 ]--- RIP: 0010:workqueue_sysfs_unregister kernel/workqueue.c:5732 [inline] RIP: 0010:destroy_workqueue+0x2e/0x800 kernel/workqueue.c:4386 Code: 49 89 fe 41 55 41 54 55 53 48 83 ec 08 e8 aa 5c 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 2e 07 00 00 49 8b 9e 18 01 00 00 48 85 db 74 19 RSP: 0018:ffffc90009577a98 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000023 RSI: ffffffff814c5bc6 RDI: 0000000000000118 RBP: ffff8880131ad340 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81a39748 R11: 0000000000000000 R12: ffff8880131ac000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000480da8 CR3: 000000000b68e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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
