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WARNING in get_probe_ref

Status: upstream: reported C repro on 2020/05/18 03:12
Subsystems: trace block
[Documentation on labels]
Reported-by: syzbot+8672dcb9d10011c0a160@syzkaller.appspotmail.com
First crash: 2068d, last: 22d
Cause bisection: introduced by (bisect log) [merge commit]:
commit 27d6e47f8e133167af51a3e39548cd3e9bed07da
Author: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Mon Oct 14 05:07:36 2019 +0000

  Merge 5.4-rc3 into staging-next

Crash: WARNING in get_probe_ref (log)
Repro: C syz .config
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (17)
Title Replies (including bot) Last reply
[syzbot] Monthly trace report (Dec 2025) 0 (1) 2025/12/22 13:07
[syzbot] Monthly trace report (Nov 2025) 0 (1) 2025/11/21 12:34
[syzbot] Monthly trace report (Jun 2025) 0 (1) 2025/06/18 13:02
[syzbot] Monthly trace report (Apr 2025) 0 (1) 2025/04/17 08:38
[syzbot] Monthly trace report (Mar 2025) 0 (1) 2025/03/16 22:21
[syzbot] Monthly trace report (Feb 2025) 0 (1) 2025/02/13 12:34
[syzbot] Monthly trace report (Jan 2025) 0 (1) 2025/01/13 12:41
[syzbot] Monthly trace report (Oct 2024) 4 (5) 2024/10/15 14:05
[syzbot] Monthly trace report (Sep 2024) 2 (3) 2024/09/10 00:22
[syzbot] Monthly trace report (Aug 2024) 0 (1) 2024/08/06 20:42
[syzbot] Monthly block report (Jul 2024) 0 (1) 2024/07/15 11:51
[syzbot] Monthly trace report (May 2024) 3 (4) 2024/06/02 21:06
[syzbot] Monthly trace report (Apr 2024) 0 (1) 2024/04/30 07:11
[syzbot] Monthly block report (Mar 2024) 0 (1) 2024/03/12 09:29
[syzbot] Monthly trace report (Jan 2024) 0 (1) 2024/01/26 21:55
[syzbot] Monthly trace report (Nov 2023) 0 (1) 2023/11/23 13:12
WARNING in get_probe_ref 0 (1) 2020/05/18 03:12
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/12/20 04:28 14m retest repro upstream report log
2025/11/12 14:43 14m retest repro upstream report log
2025/09/03 14:12 13m retest repro upstream report log
2025/07/04 01:47 23m retest repro upstream OK log
2025/07/04 01:47 24m retest repro upstream OK log
2025/07/03 21:23 19m retest repro upstream OK log
2025/06/19 20:30 14m retest repro upstream report log
2025/05/12 16:42 5h09m retest repro upstream OK log
2025/04/12 12:36 12m retest repro upstream report log
2025/03/28 12:58 31m retest repro upstream report log
▶ ▼ Fix bisection attempts (5)
Created Duration User Patch Repo Result
2020/11/07 06:09 16m bisect fix upstream error job log
2020/10/08 04:08 33m bisect fix upstream OK (0) job log log
2020/09/01 16:41 33m bisect fix upstream OK (0) job log log
2020/08/02 08:54 33m bisect fix upstream OK (0) job log log
2020/06/13 04:34 32m (6) bisect fix upstream OK (0) job log log

Sample crash report:
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007facdcfe5fa0 R14: 00007facdcfe5fa0 R15: 0000000000000003
 </TASK>
------------[ cut here ]------------
WARNING: kernel/trace/blktrace.c:1357 at blk_register_tracepoints kernel/trace/blktrace.c:1357 [inline], CPU#0: syz.0.18/5484
WARNING: kernel/trace/blktrace.c:1357 at get_probe_ref+0x41f/0x470 kernel/trace/blktrace.c:493, CPU#0: syz.0.18/5484
Modules linked in:
CPU: 0 UID: 0 PID: 5484 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:blk_register_tracepoints kernel/trace/blktrace.c:1357 [inline]
RIP: 0010:get_probe_ref+0x41f/0x470 kernel/trace/blktrace.c:493
Code: 0f 0b 90 e9 ff fd ff ff e8 4e a2 f7 ff 90 0f 0b 90 e9 1e fe ff ff e8 40 a2 f7 ff 90 0f 0b 90 e9 3d fe ff ff e8 32 a2 f7 ff 90 <0f> 0b 90 e9 5c fe ff ff e8 24 a2 f7 ff 90 0f 0b 90 e9 7b fe ff ff
RSP: 0018:ffffc90002a8fa90 EFLAGS: 00010293
RAX: ffffffff81c9b8ee RBX: 00000000fffffff4 RCX: ffff888036e40000
RDX: 0000000000000000 RSI: 00000000fffffff4 RDI: 0000000000000000
RBP: ffffc90002a8fdd0 R08: ffffc90002a8f9c7 R09: 1ffff92000551f38
R10: dffffc0000000000 R11: fffff52000551f39 R12: ffffc90002a8fc40
R13: ffffc90002a8fd40 R14: ffff888034c4d4b8 R15: 1ffff92000551f58
FS:  000055557fd08500(0000) GS:ffff88808d683000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c000093d20 CR3: 0000000011e62000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 blk_trace_setup2 kernel/trace/blktrace.c:829 [inline]
 blk_trace_ioctl+0x626/0x6e0 kernel/trace/blktrace.c:931
 blkdev_ioctl+0x4a2/0x710 block/ioctl.c:696
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7facdcd8f7c9
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:00007ffea5cb5c28 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007facdcfe5fa0 RCX: 00007facdcd8f7c9
RDX: 0000200000000240 RSI: 00000000c0c0128e RDI: 0000000000000003
RBP: 00007ffea5cb5c80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007facdcfe5fa0 R14: 00007facdcfe5fa0 R15: 0000000000000003
 </TASK>

Crashes (22):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/06 03:46 upstream d1d36025a617 d1b870e1 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2025/06/05 18:25 upstream ec7714e49479 6b6b5f21 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2020/05/14 03:47 upstream 24085f70a6e1 a885920d .config console log report syz C ci-upstream-kasan-gce
2024/09/04 01:58 upstream 88fac17500f4 9d47f20a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in get_probe_ref
2024/02/27 13:09 upstream 45ec2f5f6ed3 05e69c83 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in get_probe_ref
2024/02/27 11:29 upstream 45ec2f5f6ed3 05e69c83 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in get_probe_ref
2023/06/26 01:40 upstream 547cc9be86f4 09ffe269 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in get_probe_ref
2022/06/25 16:37 upstream 6a0a17e6c6d1 a371c43c .config strace log report syz C ci-upstream-kasan-gce-smack-root WARNING in get_probe_ref
2024/11/09 10:43 upstream 50643bbc9eb6 6b856513 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 WARNING in get_probe_ref
2025/12/06 02:32 upstream d1d36025a617 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2025/12/06 02:31 upstream d1d36025a617 d1b870e1 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2025/08/20 13:55 upstream b19a97d57c15 bd178e57 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2025/06/05 18:01 upstream ec7714e49479 6b6b5f21 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2025/03/12 10:40 upstream 0b46b049d6ec ee70e6db .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2024/11/03 06:31 upstream 3e5e6c9900c3 f00eed24 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2024/09/30 12:40 upstream 9852d85ec9d4 179f4029 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2024/09/17 16:18 upstream a940d9a43e62 c673ca06 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2024/09/08 17:27 upstream d1f2d51b711a 9750182a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2024/08/15 10:03 upstream d07b43284ab3 e4bacdaf .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2024/08/15 09:19 upstream d07b43284ab3 e4bacdaf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in get_probe_ref
2022/02/06 12:44 upstream 90c9e950c0de a7dab638 .config console log report info ci-upstream-kasan-gce-smack-root WARNING in get_probe_ref
2020/05/14 03:03 upstream 24085f70a6e1 a885920d .config console log report ci-upstream-kasan-gce
* Struck through repros no longer work on HEAD.