* WARNING in blk_mq_sched_free_requests (2)
@ 2019-09-23 18:26 syzbot
2019-09-25 0:57 ` Ming Lei
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2019-09-23 18:26 UTC (permalink / raw)
To: axboe, linux-block, linux-kernel, syzkaller-bugs
Hello,
syzbot found the following crash on:
HEAD commit: 574cc453 Merge tag 'drm-next-2019-09-18' of git://anongit...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=167c3c7e600000
kernel config: https://syzkaller.appspot.com/x/.config?x=4c1d6bfa784bebea
dashboard link: https://syzkaller.appspot.com/bug?extid=da3b7677bb913dc1b737
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+da3b7677bb913dc1b737@syzkaller.appspotmail.com
------------[ cut here ]------------
WARNING: CPU: 1 PID: 9291 at block/blk-mq-sched.c:558
blk_mq_sched_free_requests.cold+0x11/0x21 block/blk-mq-sched.c:558
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 9291 Comm: syz-executor.1 Not tainted 5.3.0+ #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+0x172/0x1f0 lib/dump_stack.c:113
panic+0x2dc/0x755 kernel/panic.c:219
__warn.cold+0x20/0x4c 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+0x23/0x30 arch/x86/entry/entry_64.S:1028
RIP: 0010:blk_mq_sched_free_requests.cold+0x11/0x21 block/blk-mq-sched.c:558
Code: fe 45 85 f6 0f 84 ab e9 ff ff e9 29 e8 ff ff 48 89 cf e8 43 0e 7d fe
eb ce e8 bc c3 42 fe 48 c7 c7 00 65 e5 87 e8 84 47 2c fe <0f> 0b e9 47 f3
ff ff 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57
RSP: 0018:ffff88805aa6f9e0 EFLAGS: 00010286
RAX: 0000000000000024 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815c26d6 RDI: ffffed100b54df2e
RBP: ffff88805aa6fa30 R08: 0000000000000024 R09: ffffed1015d260d1
R10: ffffed1015d260d0 R11: ffff8880ae930687 R12: 00000000fffffff4
R13: ffff8880a3100100 R14: ffff88808521e1d8 R15: ffff8880a3100100
blk_mq_init_sched+0x32c/0x766 block/blk-mq-sched.c:543
elevator_init_mq+0x1d3/0x3f0 block/elevator.c:719
__device_add_disk+0xd57/0x1230 block/genhd.c:705
device_add_disk+0x2b/0x40 block/genhd.c:763
add_disk include/linux/genhd.h:429 [inline]
loop_add+0x635/0x8d0 drivers/block/loop.c:2051
loop_control_ioctl drivers/block/loop.c:2152 [inline]
loop_control_ioctl+0x165/0x360 drivers/block/loop.c:2134
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0xdb6/0x13e0 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+0xfa/0x760 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a09
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4830110c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a09
RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000005
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f48301116d4
R13: 00000000004c3118 R14: 00000000004d69f8 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: WARNING in blk_mq_sched_free_requests (2)
2019-09-23 18:26 WARNING in blk_mq_sched_free_requests (2) syzbot
@ 2019-09-25 0:57 ` Ming Lei
0 siblings, 0 replies; 2+ messages in thread
From: Ming Lei @ 2019-09-25 0:57 UTC (permalink / raw)
To: syzbot; +Cc: axboe, linux-block, linux-kernel, syzkaller-bugs
On Mon, Sep 23, 2019 at 11:26:11AM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 574cc453 Merge tag 'drm-next-2019-09-18' of git://anongit...
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=167c3c7e600000
> kernel config: https://syzkaller.appspot.com/x/.config?x=4c1d6bfa784bebea
> dashboard link: https://syzkaller.appspot.com/bug?extid=da3b7677bb913dc1b737
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+da3b7677bb913dc1b737@syzkaller.appspotmail.com
>
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 9291 at block/blk-mq-sched.c:558
> blk_mq_sched_free_requests.cold+0x11/0x21 block/blk-mq-sched.c:558
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 1 PID: 9291 Comm: syz-executor.1 Not tainted 5.3.0+ #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+0x172/0x1f0 lib/dump_stack.c:113
> panic+0x2dc/0x755 kernel/panic.c:219
> __warn.cold+0x20/0x4c 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+0x23/0x30 arch/x86/entry/entry_64.S:1028
> RIP: 0010:blk_mq_sched_free_requests.cold+0x11/0x21 block/blk-mq-sched.c:558
> Code: fe 45 85 f6 0f 84 ab e9 ff ff e9 29 e8 ff ff 48 89 cf e8 43 0e 7d fe
> eb ce e8 bc c3 42 fe 48 c7 c7 00 65 e5 87 e8 84 47 2c fe <0f> 0b e9 47 f3 ff
> ff 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57
> RSP: 0018:ffff88805aa6f9e0 EFLAGS: 00010286
> RAX: 0000000000000024 RBX: 0000000000000000 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffffffff815c26d6 RDI: ffffed100b54df2e
> RBP: ffff88805aa6fa30 R08: 0000000000000024 R09: ffffed1015d260d1
> R10: ffffed1015d260d0 R11: ffff8880ae930687 R12: 00000000fffffff4
> R13: ffff8880a3100100 R14: ffff88808521e1d8 R15: ffff8880a3100100
> blk_mq_init_sched+0x32c/0x766 block/blk-mq-sched.c:543
> elevator_init_mq+0x1d3/0x3f0 block/elevator.c:719
> __device_add_disk+0xd57/0x1230 block/genhd.c:705
> device_add_disk+0x2b/0x40 block/genhd.c:763
> add_disk include/linux/genhd.h:429 [inline]
> loop_add+0x635/0x8d0 drivers/block/loop.c:2051
> loop_control_ioctl drivers/block/loop.c:2152 [inline]
> loop_control_ioctl+0x165/0x360 drivers/block/loop.c:2134
> vfs_ioctl fs/ioctl.c:46 [inline]
> file_ioctl fs/ioctl.c:509 [inline]
> do_vfs_ioctl+0xdb6/0x13e0 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+0xfa/0x760 arch/x86/entry/common.c:290
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x459a09
> Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007f4830110c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a09
> RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000005
> RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f48301116d4
> R13: 00000000004c3118 R14: 00000000004d69f8 R15: 00000000ffffffff
> Kernel Offset: disabled
> Rebooting in 86400 seconds..
>
We removed q->sysfs_lock from elevator_init_mq() in the commit: c48dac137a62a
("block: don't hold q->sysfs_lock in elevator_init_mq")
And lockdep_assert_held() could be killed from blk_mq_sched_free_requests().
I will post a patch to fix the issue later.
Thanks,
Ming
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-09-23 18:26 WARNING in blk_mq_sched_free_requests (2) syzbot
2019-09-25 0:57 ` Ming Lei
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