syzbot


WARNING in blk_mq_sched_free_requests

Status: fixed on 2019/07/10 21:40
Subsystems: block
[Documentation on labels]
Reported-by: syzbot+b9d0d56867048c7bcfde@syzkaller.appspotmail.com
Fix commit: c326f846ebc2 blk-mq: remove WARN_ON(!q->elevator) from blk_mq_sched_free_requests
First crash: 1811d, last: 1808d
Cause bisection: introduced by (bisect log) :
commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon May 6 00:42:58 2019 +0000

  Linux 5.1

  
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] blk-mq: remove WARN_ON(!q->elevator) from blk_mq_sched_free_requests 2 (2) 2019/06/13 09:06
WARNING in blk_mq_sched_free_requests 1 (2) 2019/06/11 09:54
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in blk_mq_sched_free_requests (2) block 7 1701d 1706d 13/26 fixed on 2019/10/15 23:40

Sample crash report:
Code: e8 bc b5 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 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f735bcf2d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 00000000004466e9
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003
RBP: 00000000006dbc30 R08: 0000000000000002 R09: 0000000000003034
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c
R13: 00007f735bcf2d90 R14: 0000000000000004 R15: 20c49ba5e353f7cf
WARNING: CPU: 0 PID: 9739 at block/blk-mq-sched.c:558 blk_mq_sched_free_requests+0x207/0x290 block/blk-mq-sched.c:558
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 9739 Comm: syz-executor118 Not tainted 5.2.0-rc4 #25
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+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2cb/0x744 kernel/panic.c:219
 __warn.cold+0x20/0x4d kernel/panic.c:576
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:986
RIP: 0010:blk_mq_sched_free_requests+0x207/0x290 block/blk-mq-sched.c:558
Code: ff e8 6d bf 30 fe 31 ff 89 c3 89 c6 e8 32 ac 4a fe 85 db 0f 85 68 fe ff ff e8 a5 aa 4a fe 0f 0b e9 5c fe ff ff e8 99 aa 4a fe <0f> 0b e9 7f fe ff ff 48 c7 c7 b4 e5 80 89 e8 b6 48 83 fe e9 28 fe
RSP: 0018:ffff88808ab9fa60 EFLAGS: 00010293
RAX: ffff88808c9f6340 RBX: 0000000000000001 RCX: ffffffff8326000e
RDX: 0000000000000000 RSI: ffffffff83260027 RDI: ffff88809f27b020
RBP: ffff88808ab9fab0 R08: ffff88808c9f6340 R09: ffffed1015d06be0
R10: ffffed1015d06bdf R11: ffff8880ae835efb R12: 00000000fffffff4
R13: ffff88809f27b008 R14: ffff88809ec4e658 R15: ffff88809f27b008
 blk_mq_init_sched+0x32c/0x770 block/blk-mq-sched.c:542
 elevator_init_mq+0xcd/0x160 block/elevator.c:622
 blk_mq_init_allocated_queue+0x10e2/0x15b0 block/blk-mq.c:2921
 blk_mq_init_queue+0x62/0xb0 block/blk-mq.c:2705
 loop_add+0x2dd/0x8d0 drivers/block/loop.c:2004
 loop_control_ioctl drivers/block/loop.c:2157 [inline]
 loop_control_ioctl+0x165/0x360 drivers/block/loop.c:2139
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4466e9
Code: e8 bc b5 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 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f735bcf2d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 00000000004466e9
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003
RBP: 00000000006dbc30 R08: 0000000000000002 R09: 0000000000003034
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c
R13: 00007f735bcf2d90 R14: 0000000000000004 R15: 20c49ba5e353f7cf
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/06/10 11:54 upstream d1fdb6d8f6a4 0159583c .config console log report syz C ci-upstream-kasan-gce-smack-root
2019/06/13 11:34 upstream b076173a309e 3f4e812b .config console log report ci-upstream-kasan-gce-selinux-root
2019/06/10 10:47 upstream d1fdb6d8f6a4 0159583c .config console log report ci-upstream-kasan-gce-smack-root
2019/06/11 13:06 linux-next f08776cae7f5 5b5826d0 .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.