syzbot


kernel BUG in qlist_free_all (4)

Status: moderation: reported on 2026/03/23 00:04
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+55ef36bbdcda65608180@syzkaller.appspotmail.com
First crash: 9d13h, last: 9d13h
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in qlist_free_all (2) fs -1 C done 5 163d 194d 29/29 fixed on 2025/11/18 08:45
upstream kernel BUG in qlist_free_all net fs -1 C done done 12 342d 490d 28/29 fixed on 2025/06/10 16:19
upstream kernel BUG in qlist_free_all (3) mm -1 1 129d 125d 0/29 auto-obsoleted due to no activity on 2026/02/26 15:09

Sample crash report:
------------[ cut here ]------------
kernel BUG at arch/x86/mm/physaddr.c:28!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5192 Comm: udevd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__phys_addr+0xfa/0x180 arch/x86/mm/physaddr.c:28
Code: 48 d3 e8 48 89 c3 48 89 c6 e8 72 9c 4e 00 48 85 db 75 11 e8 88 a1 4e 00 48 89 e8 5b 5d 41 5c e9 fc 24 d7 09 e8 77 a1 4e 00 90 <0f> 0b e8 6f a1 4e 00 48 c7 c0 10 10 5c 8e 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90002f37c30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: b8ffff89005f4347 RCX: ffffffff81b97663
RDX: ffff88807ec30000 RSI: ffffffff81b976e9 RDI: ffff88807ec30000
RBP: b9007708805f4347 R08: 0000000000000006 R09: b8ffff89005f4347
R10: b9007708805f4347 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90002f37c80 R15: 00000000000000c0
FS:  00007f08220ae880(0000) GS:ffff88812434a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000015000 CR3: 000000007ea22000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 virt_to_slab mm/slab.h:172 [inline]
 qlink_to_cache mm/kasan/quarantine.c:131 [inline]
 qlist_free_all+0x5f/0xe0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4538 [inline]
 slab_alloc_node mm/slub.c:4866 [inline]
 kmem_cache_alloc_noprof+0x241/0x6e0 mm/slub.c:4873
 alloc_filename fs/namei.c:142 [inline]
 do_getname+0x35/0x390 fs/namei.c:182
 getname include/linux/fs.h:2512 [inline]
 class_filename_constructor include/linux/fs.h:2539 [inline]
 do_sys_openat2+0xc5/0x1e0 fs/open.c:1365
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x12d/0x210 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f08218a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fffb9e21db0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f08220ae880 RCX: 00007f08218a7407
RDX: 0000000000080141 RSI: 000055d82b95802e RDI: ffffffffffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001a4 R11: 0000000000000202 R12: 00000000ffffffff
R13: 00000000ffffffff R14: ffffffffffffffff R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__phys_addr+0xfa/0x180 arch/x86/mm/physaddr.c:28
Code: 48 d3 e8 48 89 c3 48 89 c6 e8 72 9c 4e 00 48 85 db 75 11 e8 88 a1 4e 00 48 89 e8 5b 5d 41 5c e9 fc 24 d7 09 e8 77 a1 4e 00 90 <0f> 0b e8 6f a1 4e 00 48 c7 c0 10 10 5c 8e 48 ba 00 00 00 00 00 fc
RSP: 0018:ffffc90002f37c30 EFLAGS: 00010293
RAX: 0000000000000000 RBX: b8ffff89005f4347 RCX: ffffffff81b97663
RDX: ffff88807ec30000 RSI: ffffffff81b976e9 RDI: ffff88807ec30000
RBP: b9007708805f4347 R08: 0000000000000006 R09: b8ffff89005f4347
R10: b9007708805f4347 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90002f37c80 R15: 00000000000000c0
FS:  00007f08220ae880(0000) GS:ffff88812434a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000015000 CR3: 000000007ea22000 CR4: 00000000003526f0

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/18 18:56 upstream a989fde763f4 0199f9a1 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto kernel BUG in qlist_free_all
* Struck through repros no longer work on HEAD.