gfs2: fsid=syz:syz.0: about to withdraw this file system slab gfs2_quotad start ffff888043ac7000 pointer offset 120 size 272 list_add corruption. prev->next should be next (ffff888144eea000), but was ffff888043ac7078. (prev=ffff888043ac7078). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:34! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 20970 Comm: syz.5.4239 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__list_add_valid_or_report+0x123/0x130 lib/list_debug.c:32 Code: e8 32 46 6d fd 43 80 3c 2c 00 74 08 4c 89 f7 e8 53 26 8f fd 49 8b 16 48 c7 c7 c0 89 c0 8b 48 89 de 4c 89 f1 e8 ce b2 8f fc 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900053f7c20 EFLAGS: 00010246 RAX: 0000000000000075 RBX: ffff888144eea000 RCX: 97a1e46b51248c00 RDX: ffffc9000c6c1000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: 1ffff110289dd401 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bbae40 R12: 1ffff11008758e0f R13: dffffc0000000000 R14: ffff888043ac7078 R15: ffff888043ac7078 FS: 00007f79b03a06c0(0000) GS:ffff888125e1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c25085b CR3: 0000000054137000 CR4: 0000000000350ef0 Call Trace: __list_add_valid include/linux/list.h:96 [inline] __list_add include/linux/list.h:158 [inline] list_add_tail include/linux/list.h:191 [inline] list_lru_add+0xf2/0x270 mm/list_lru.c:171 qd_put+0x114/0x190 fs/gfs2/quota.c:342 gfs2_quota_sync+0x3c4/0x460 fs/gfs2/quota.c:1361 __iterate_supers+0x13d/0x290 fs/super.c:924 quota_sync_all fs/quota/quota.c:69 [inline] __do_sys_quotactl fs/quota/quota.c:938 [inline] __se_sys_quotactl+0x353/0x950 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f79af58f749 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:00007f79b03a0038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007f79af7e5fa0 RCX: 00007f79af58f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100 RBP: 00007f79af613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f79af7e6038 R14: 00007f79af7e5fa0 R15: 00007ffd67ac4d98 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_add_valid_or_report+0x123/0x130 lib/list_debug.c:32 Code: e8 32 46 6d fd 43 80 3c 2c 00 74 08 4c 89 f7 e8 53 26 8f fd 49 8b 16 48 c7 c7 c0 89 c0 8b 48 89 de 4c 89 f1 e8 ce b2 8f fc 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900053f7c20 EFLAGS: 00010246 RAX: 0000000000000075 RBX: ffff888144eea000 RCX: 97a1e46b51248c00 RDX: ffffc9000c6c1000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: 1ffff110289dd401 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bbae40 R12: 1ffff11008758e0f R13: dffffc0000000000 R14: ffff888043ac7078 R15: ffff888043ac7078 FS: 00007f79b03a06c0(0000) GS:ffff888125e1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c25085b CR3: 0000000054137000 CR4: 0000000000350ef0