syzbot


INFO: task hung in blkdev_common_ioctl (2)

Status: upstream: reported C repro on 2024/05/05 13:20
Bug presence: origin:lts-only
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+ea8662f69d178a712dc0@syzkaller.appspotmail.com
First crash: 480d, last: 2d16h
Fix bisection: failed (error log, bisect log)
  
Bug presence (2)
Date Name Commit Repro Result
2025/08/11 linux-5.15.y (ToT) c79648372d02 C [report] INFO: task hung in blkdev_common_ioctl
2025/08/11 upstream (ToT) 8f5ae30d69d7 C Didn't crash
Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: task hung in blkdev_common_ioctl 1 1 844d 844d 0/3 auto-obsoleted due to no activity on 2023/08/23 09:04
linux-6.1 INFO: task hung in blkdev_common_ioctl (3) origin:lts-only 1 syz inconclusive 2 234d 234d 0/3 upstream: reported syz repro on 2025/01/06 08:24
linux-6.1 INFO: task hung in blkdev_common_ioctl (2) 1 3 512d 596d 0/3 auto-obsoleted due to no activity on 2024/07/12 01:42
linux-6.1 INFO: task hung in blkdev_common_ioctl 1 3 849d 900d 0/3 auto-obsoleted due to no activity on 2023/08/23 09:07
upstream INFO: task can't die in blkdev_common_ioctl block 1 C 386 21d 1244d 0/29 closed as dup on 2022/04/02 11:26
Last patch testing requests (8)
Created Duration User Patch Repo Result
2025/08/25 23:40 14m retest repro linux-5.15.y report log
2025/08/25 23:40 16m retest repro linux-5.15.y report log
2025/08/25 23:40 21m retest repro linux-5.15.y report log
2025/08/25 23:40 46m retest repro linux-5.15.y report log
2025/08/04 03:47 16m retest repro linux-5.15.y report log
2025/07/16 19:58 1h50m retest repro linux-5.15.y report log
2025/06/10 06:06 40m retest repro linux-5.15.y report log
2025/06/10 06:06 15m retest repro linux-5.15.y report log
Fix bisection attempts (4)
Created Duration User Patch Repo Result
2025/08/11 11:33 2h27m fix candidate upstream OK (0) job log
2025/07/01 17:02 9m fix candidate upstream error job log
2025/05/03 12:36 1m fix candidate upstream error job log
2024/06/26 23:09 0m bisect fix linux-5.15.y error job log

Sample crash report:
INFO: task syz.2.19:4417 blocked for more than 143 seconds.
      Not tainted 5.15.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19        state:D
 stack:27200 pid: 4417 ppid:  4319 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1e0 kernel/sched/core.c:6459
 rwsem_down_write_slowpath+0xc46/0x11f0 kernel/locking/rwsem.c:1165
 filemap_invalidate_lock include/linux/fs.h:832 [inline]
 blk_ioctl_zeroout block/ioctl.c:183 [inline]
 blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
 blkdev_ioctl+0x295/0x690 block/ioctl.c:598
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb7d13f4be9
RSP: 002b:00007fff0a4415a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb7d161bfa0 RCX: 00007fb7d13f4be9
RDX: 0000200000000040 RSI: 000000000000127f RDI: 0000000000000003
RBP: 00007fb7d1477e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb7d161bfa0 R14: 00007fb7d161bfa0 R15: 0000000000000003
 </TASK>
INFO: task syz.1.18:4423 blocked for more than 144 seconds.
      Not tainted 5.15.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.18        state:D stack:27648 pid: 4423 ppid:  4315 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1e0 kernel/sched/core.c:6459
 rwsem_down_write_slowpath+0xc46/0x11f0 kernel/locking/rwsem.c:1165
 filemap_invalidate_lock include/linux/fs.h:832 [inline]
 blk_ioctl_zeroout block/ioctl.c:183 [inline]
 blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
 blkdev_ioctl+0x295/0x690 block/ioctl.c:598
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f735110fbe9
RSP: 002b:00007fffe96e9bd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7351336fa0 RCX: 00007f735110fbe9
RDX: 0000200000000040 RSI: 000000000000127f RDI: 0000000000000003
RBP: 00007f7351192e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7351336fa0 R14: 00007f7351336fa0 R15: 0000000000000003
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c11c360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by kworker/0:2/1107:
 #0: ffff88802a9abd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1
 #1: ffffc90004d67d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7a3/0x1000 kernel/workqueue.c:2285
 #2: ffffffff8d235f48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1520 net/ipv6/addrconf.c:4111
4 locks held by kworker/u4:4/3101:
2 locks held by getty/3945:
 #0: ffff88802bf4a098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900025e62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158
3 locks held by kworker/u5:1/4226:
 #0: ffff88807cfe9138 ((wq_completion)hci31){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1
 #1: ffffc90002f9fd00 ((work_completion)(&hdev->power_on)){+.+.}-{0:0}, at: process_one_work+0x7a3/0x1000 kernel/workqueue.c:2285
 #2: ffff888073e7cff0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0xa4/0x1270 net/bluetooth/hci_core.c:1446
3 locks held by kworker/1:5/4294:
 #0: ffff88802a9abd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1
 #1: ffffc9000454fd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7a3/0x1000 kernel/workqueue.c:2285
 #2: ffffffff8d235f48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1520 net/ipv6/addrconf.c:4111
1 lock held by syz.3.20/4416:
1 lock held by syz.2.19/4417:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.1.18/4423:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.5.22/4491:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.6.23/4549:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.7.24/4550:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.8.25/4551:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.9.26/4552:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.4.27/4579:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.0.28/4653:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.2.29/4656:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.3.30/4658:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.1.31/4664:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.5.32/4684:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.7.34/4777:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.6.33/4789:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.9.35/4794:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.8.36/4811:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.4.37/4818:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.0.38/4848:
 #0: 
ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.2.39/4889:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.3.40/4893:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.1.41/4915:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.5.42/4930:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.7.43/4948:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.9.45/5016:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.6.44/5019:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
3 locks held by syz-executor/5030:
1 lock held by syz.8.46/5065:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
1 lock held by syz.4.47/5072:
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_zeroout block/ioctl.c:183 [inline]
 #0: ffff88814088acb8 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x17d6/0x1c70 block/ioctl.c:487
2 locks held by syz-executor/5078:
1 lock held by syz-executor/5081:
 #0: ffffffff8d22a2d0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x32e/0x5b0 net/core/net_namespace.c:499

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xe0f/0xe50 kernel/hung_task.c:369
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4416 Comm: syz.3.20 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:226 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x4/0x80 kernel/kcov.c:267
Code: 77 22 89 ff 89 f6 4a c7 44 02 08 02 00 00 00 4a 89 7c 02 10 4a 89 74 02 18 4a 89 44 02 20 48 ff c1 48 89 0a c3 90 48 8b 04 24 <65> 48 8b 0d 34 aa 8a 7e 65 8b 15 35 aa 8a 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90004de73f8 EFLAGS: 00000206
RAX: ffffffff83c10b18 RBX: 000000000000004d RCX: ffff888072d03b80
RDX: 0000000000000000 RSI: 00000000000000ff RDI: 000000000000004d
RBP: ffffc90004de7550 R08: ffff888072d03b80 R09: 0000000000000004
R10: 0000000000000009 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000001000 R14: 0000000000000009 R15: 00000000000000ff
FS:  0000555573689500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe27d350ddc CR3: 0000000077bd6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 blk_bio_segment_split block/blk-merge.c:266 [inline]
 __blk_queue_split+0xbf8/0x16a0 block/blk-merge.c:350
 blk_mq_submit_bio+0x1af/0x17b0 block/blk-mq.c:2218
 __submit_bio+0x7bd/0x810 block/blk-core.c:917
 __submit_bio_noacct_mq block/blk-core.c:997 [inline]
 submit_bio_noacct+0x650/0x6d0 block/blk-core.c:1027
 submit_bio+0x2be/0x560 block/blk-core.c:1089
 blk_next_bio block/blk-lib.c:19 [inline]
 __blkdev_issue_zero_pages+0x147/0x3a0 block/blk-lib.c:319
 blkdev_issue_zeroout+0x254/0x4b0 block/blk-lib.c:413
 blk_ioctl_zeroout block/ioctl.c:188 [inline]
 blkdev_common_ioctl+0x19e5/0x1c70 block/ioctl.c:487
 blkdev_ioctl+0x295/0x690 block/ioctl.c:598
 block_ioctl+0xac/0xf0 block/fops.c:496
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fdff6c14be9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdc7c28768 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdff6e3bfa0 RCX: 00007fdff6c14be9
RDX: 0000200000000040 RSI: 000000000000127f RDI: 0000000000000003
RBP: 00007fdff6c97e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdff6e3bfa0 R14: 00007fdff6e3bfa0 R15: 0000000000000003
 </TASK>

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/10 11:17 linux-5.15.y c79648372d02 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in blkdev_common_ioctl
2024/05/20 09:17 linux-5.15.y 83655231580b c0f1611a .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_common_ioctl
2024/05/05 13:20 linux-5.15.y 284087d4f7d5 610f2a54 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 INFO: task hung in blkdev_common_ioctl
2025/01/06 10:20 linux-5.15.y 91786f140358 f3558dbf .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in blkdev_common_ioctl
2025/01/06 09:19 linux-5.15.y 91786f140358 f3558dbf .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in blkdev_common_ioctl
2025/01/06 08:17 linux-5.15.y 91786f140358 f3558dbf .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in blkdev_common_ioctl
2025/01/06 07:05 linux-5.15.y 91786f140358 f3558dbf .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in blkdev_common_ioctl
* Struck through repros no longer work on HEAD.