WARNING in blk_mq_release

Status: upstream: reported on 2026/08/04 19:49
Reported-by: syzbot+d0cf39154a61fbf95a18@syzkaller.appspotmail.com
First crash: 1d15h, last: 6h29m
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in blk_mq_release block -1 syz, C error 11 1439d 1458d 22/29 fixed on 2023/02/24 13:50

Sample crash report:
nvme nvme0: Removing ctrl: NQN "nqn.2014-08.org.nvmexpress.discovery"
------------[ cut here ]------------
WARNING: CPU: 1 PID: 9 at block/blk-mq.c:4133 blk_mq_release+0x104/0x2c0 block/blk-mq.c:4133
Modules linked in:
CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: nvme-delete-wq nvme_delete_ctrl_work
RIP: 0010:blk_mq_release+0x104/0x2c0 block/blk-mq.c:4133
Code: 89 df 4c 89 fe 48 c7 c2 ff ff ff ff b9 08 00 00 00 e8 30 da 26 06 48 85 c0 74 13 49 89 c4 e8 f3 8b 85 fd eb af e8 ec 8b 85 fd <0f> 0b eb d1 e8 e3 8b 85 fd eb 05 e8 dc 8b 85 fd 48 8b 44 24 18 4c
RSP: 0018:ffffc900000e79a0 EFLAGS: 00010293
RAX: ffffffff83fca234 RBX: ffff888027336508 RCX: ffff88813fe80000
RDX: 0000000000000000 RSI: ffffffff8a8c2920 RDI: ffffffff8adf5de0
RBP: ffffc900000e7a68 R08: ffffffff8e210aef R09: 1ffffffff1c4215d
R10: dffffc0000000000 R11: fffffbfff1c4215e R12: ffff88801e3c4aa8
R13: dffffc0000000000 R14: 1ffff9200001cf3c R15: ffffc900000e7a00
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000026d000 CR3: 000000005eeac000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 blk_release_queue+0x12a/0x1e0 block/blk-sysfs.c:774
 kobject_cleanup lib/kobject.c:681 [inline]
 kobject_release lib/kobject.c:712 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x217/0x450 lib/kobject.c:729
 nvme_free_ctrl+0xc2/0x510 drivers/nvme/host/core.c:5196
 device_release+0x92/0x1c0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:681 [inline]
 kobject_release lib/kobject.c:712 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x217/0x450 lib/kobject.c:729
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (23):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/06 04:20 linux-6.1.y fb28aa725e05 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in blk_mq_release
2026/08/05 22:44 linux-6.1.y fb28aa725e05 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in blk_mq_release
2026/08/05 00:57 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in blk_mq_release
2026/08/05 00:45 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in blk_mq_release
2026/08/05 00:15 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in blk_mq_release
2026/08/05 00:12 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in blk_mq_release
2026/08/05 00:09 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in blk_mq_release
2026/08/04 23:03 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in blk_mq_release
2026/08/04 23:02 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in blk_mq_release
2026/08/04 21:43 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in blk_mq_release
2026/08/04 21:41 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in blk_mq_release
2026/08/04 21:41 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
2026/08/04 20:20 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
2026/08/04 20:19 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
2026/08/04 20:07 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
2026/08/04 20:07 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
2026/08/04 20:04 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
2026/08/04 20:03 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
2026/08/04 19:55 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
2026/08/04 19:51 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
2026/08/04 19:50 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
2026/08/04 19:50 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
2026/08/04 19:48 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in blk_mq_release
* Struck through repros no longer work on HEAD.