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* [syzbot] [block?] general protection fault in blk_mq_quiesce_queue
@ 2026-09-03 20:59 syzbot
  2026-09-04  1:31 ` Edward Adam Davis
                   ` (7 more replies)
  0 siblings, 8 replies; 13+ messages in thread
From: syzbot @ 2026-09-03 20:59 UTC (permalink / raw)
  To: axboe, linux-block, linux-kernel, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    940de590b839 Merge tag 'hardening-v7.3-rc2' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13df50f9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=85bc5cc2fc7394d9
dashboard link: https://syzkaller.appspot.com/bug?extid=fefa0af09f7891b1800e
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=166a48f9580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=116a48f9580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-940de590.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f3f674f98efb/vmlinux-940de590.xz
kernel image: https://storage.googleapis.com/syzbot-assets/132222426e71/bzImage-940de590.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fefa0af09f7891b1800e@syzkaller.appspotmail.com

wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
Oops: general protection fault, probably for non-canonical address 0xdffffc000000001c: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x00000000000000e0-0x00000000000000e7]
CPU: 1 UID: 0 PID: 1158 Comm: kworker/u33:8 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: nvme-reset-wq nvme_loop_reset_ctrl_work
RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:210
Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 e9 0e 36 53 09 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc90002c2fae0 EFLAGS: 00010082
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8bd0370a RDI: dffffc000000001c
RBP: 00000000000000e0 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff91452c5f R11: 0000000000000001 R12: ffffffff8bd0370a
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888096a67000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f6824da4 CR3: 000000004c4f1000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __kasan_check_byte+0x13/0x50 mm/kasan/common.c:573
 kasan_check_byte include/linux/kasan.h:402 [inline]
 lock_acquire kernel/locking/lockdep.c:5882 [inline]
 lock_acquire+0x132/0x380 kernel/locking/lockdep.c:5865
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:155 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:181
 blk_mq_quiesce_queue_nowait block/blk-mq.c:265 [inline]
 blk_mq_quiesce_queue+0x21/0x1c0 block/blk-mq.c:301
 nvme_quiesce_admin_queue+0x6e/0x100 drivers/nvme/host/core.c:5412
 nvme_loop_shutdown_ctrl drivers/nvme/target/loop.c:415 [inline]
 nvme_loop_reset_ctrl_work+0xa2/0x5d0 drivers/nvme/target/loop.c:447
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:kasan_byte_accessible+0x15/0x30 mm/kasan/generic.c:210
Code: 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 b8 00 00 00 00 00 fc ff df 48 c1 ef 03 48 01 c7 <0f> b6 07 3c 07 0f 96 c0 e9 0e 36 53 09 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc90002c2fae0 EFLAGS: 00010082
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8bd0370a RDI: dffffc000000001c
RBP: 00000000000000e0 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff91452c5f R11: 0000000000000001 R12: ffffffff8bd0370a
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888096a67000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f6824da4 CR3: 000000004c4f1000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	0f 1f 00             	nopl   (%rax)
   5:	90                   	nop
   6:	90                   	nop
   7:	90                   	nop
   8:	90                   	nop
   9:	90                   	nop
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	0f 1f 40 d6          	nopl   -0x2a(%rax)
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 c1 ef 03          	shr    $0x3,%rdi
  27:	48 01 c7             	add    %rax,%rdi
* 2a:	0f b6 07             	movzbl (%rdi),%eax <-- trapping instruction
  2d:	3c 07                	cmp    $0x7,%al
  2f:	0f 96 c0             	setbe  %al
  32:	e9 0e 36 53 09       	jmp    0x9533645
  37:	66                   	data16
  38:	66                   	data16
  39:	2e                   	cs
  3a:	0f                   	.byte 0xf
  3b:	1f                   	(bad)
  3c:	84 00                	test   %al,(%rax)


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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If the report is already addressed, let syzbot know by replying with:
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#syz undup

^ permalink raw reply	[flat|nested] 13+ messages in thread
end of thread, other threads:[~2026-11-10 18:57 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2026-09-03 20:59 [syzbot] [block?] general protection fault in blk_mq_quiesce_queue syzbot
2026-09-04  1:31 ` Edward Adam Davis
2026-09-04  1:57   ` syzbot
2026-09-04  2:38 ` Edward Adam Davis
2026-09-04  3:09   ` syzbot
2026-09-04  4:41 ` Edward Adam Davis
2026-09-04  5:05   ` syzbot
2026-09-04  9:10 ` Edward Adam Davis
2026-09-04  9:33   ` syzbot
2026-11-10 18:52 ` Forwarded: " syzbot
2026-11-10 18:53 ` syzbot
2026-11-10 18:55 ` syzbot
2026-11-10 18:57 ` syzbot

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