syzbot


WARNING: ODEBUG bug in rfcomm_dev_ioctl

Status: fixed on 2020/04/28 10:48
Reported-by: syzbot+0b14a6cccc936e2b7915@syzkaller.appspotmail.com
Fix commit: 78a4ad28608a Bluetooth: RFCOMM: fix ODEBUG bug in rfcomm_dev_ioctl
First crash: 820d, last: 820d

Fix bisection: fixed by (bisect log) :
commit 78a4ad28608a530b5bd85da60307d61133e68040
Author: Qiujun Huang <hqjagain@gmail.com>
Date: Sun Mar 8 09:45:27 2020 +0000

  Bluetooth: RFCOMM: fix ODEBUG bug in rfcomm_dev_ioctl

similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 WARNING: ODEBUG bug in rfcomm_dev_ioctl C done 2 824d 824d 1/1 fixed on 2020/04/23 14:56
upstream WARNING: ODEBUG bug in rfcomm_dev_ioctl 1 841d 841d 17/22 fixed on 2020/05/10 10:42

Sample crash report:
audit: type=1400 audit(1585388686.892:36): avc:  denied  { map } for  pid=8244 comm="syz-executor838" path="/root/syz-executor838454775" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: rfcomm_dlc_timeout+0x0/0x70 include/linux/compiler.h:220
WARNING: CPU: 1 PID: 8247 at lib/debugobjects.c:325 debug_print_object+0x160/0x250 lib/debugobjects.c:325
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8247 Comm: syz-executor838 Not tainted 4.19.113-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x46 kernel/panic.c:541
 report_bug+0x262/0x2a0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037
RIP: 0010:debug_print_object+0x160/0x250 lib/debugobjects.c:325
Code: dd 60 0b ab 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd 60 0b ab 87 48 c7 c7 a0 00 ab 87 e8 0b 65 e6 fd <0f> 0b 83 05 13 11 37 06 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89
RSP: 0018:ffff88809f757920 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8152d3a1 RDI: ffffed1013eeaf16
RBP: 0000000000000001 R08: ffff888090af2540 R09: ffffed1015ce3ee3
R10: ffffed1015ce3ee2 R11: ffff8880ae71f717 R12: ffffffff88b9faa0
R13: ffffffff81581ee0 R14: ffffffff8b8c98c8 R15: ffff88808b5bd3a8
 __debug_check_no_obj_freed lib/debugobjects.c:785 [inline]
 debug_check_no_obj_freed+0x2a3/0x42e lib/debugobjects.c:817
 kfree+0xbb/0x220 mm/slab.c:3821
 rfcomm_dlc_put include/net/bluetooth/rfcomm.h:258 [inline]
 __rfcomm_create_dev net/bluetooth/rfcomm/tty.c:417 [inline]
 rfcomm_create_dev net/bluetooth/rfcomm/tty.c:486 [inline]
 rfcomm_dev_ioctl+0x1827/0x1b20 net/bluetooth/rfcomm/tty.c:588
 rfcomm_sock_ioctl+0x86/0xb0 net/bluetooth/rfcomm/sock.c:902
 sock_do_ioctl+0xd8/0x2f0 net/socket.c:950
 sock_ioctl+0x325/0x610 net/socket.c:1074
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcda/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441309
Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff89399938 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441309
RDX: 0000000020000100 RSI: 00000000400452c8 RDI: 0000000000000005
RBP: 0000000000010cb7 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000402130
R13: 00000000004021c0 R14: 0000000000000000 R15: 0000000000000000

======================================================

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-19 2020/03/28 09:47 linux-4.19.y 54b4fa6d3955 831e9a81 .config log report syz C