slab gfs2_quotad start ffff888053cf4000 pointer offset 120 size 272 list_add corruption. prev->next should be next (ffff88801dabda00), but was ffff888053cf4078. (prev=ffff888053cf4078). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:34! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5824 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:__list_add_valid_or_report+0x123/0x130 lib/list_debug.c:32 Code: e8 b2 83 5f fd 43 80 3c 2c 00 74 08 4c 89 f7 e8 c3 13 82 fd 49 8b 16 48 c7 c7 e0 3c 07 8c 48 89 de 4c 89 f1 e8 4e fe 7c 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:ffffc90003f1fb58 EFLAGS: 00010246 RAX: 0000000000000075 RBX: ffff88801dabda00 RCX: 704dd2d516c18000 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 1ffff11003b57b41 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1c7ce48 R12: 1ffff1100a79e80f R13: dffffc0000000000 R14: ffff888053cf4078 R15: ffff888053cf4078 FS: 0000555589471500(0000) GS:ffff8881256f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7d3db83c00 CR3: 000000005d6e0000 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 qd_ungrab_sync fs/gfs2/quota.c:493 [inline] gfs2_quota_sync+0x322/0x470 fs/gfs2/quota.c:1351 gfs2_sync_fs+0x4c/0xb0 fs/gfs2/super.c:658 sync_filesystem+0xee/0x230 fs/sync.c:56 generic_shutdown_super+0x6f/0x2c0 fs/super.c:622 kill_block_super+0x44/0x90 fs/super.c:1722 deactivate_locked_super+0xbc/0x130 fs/super.c:474 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1318 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb580d9c117 Code: a2 c7 05 7c 94 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fffb7ed02b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fb580e0471f RCX: 00007fb580d9c117 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffb7ed0370 RBP: 00007fffb7ed0370 R08: 00007fffb7ed1370 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffb7ed1400 R13: 00007fb580e0471f R14: 000000000002af6c R15: 00007fffb7ed1440 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_add_valid_or_report+0x123/0x130 lib/list_debug.c:32 Code: e8 b2 83 5f fd 43 80 3c 2c 00 74 08 4c 89 f7 e8 c3 13 82 fd 49 8b 16 48 c7 c7 e0 3c 07 8c 48 89 de 4c 89 f1 e8 4e fe 7c 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:ffffc90003f1fb58 EFLAGS: 00010246 RAX: 0000000000000075 RBX: ffff88801dabda00 RCX: 704dd2d516c18000 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: 1ffff11003b57b41 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1c7ce48 R12: 1ffff1100a79e80f R13: dffffc0000000000 R14: ffff888053cf4078 R15: ffff888053cf4078 FS: 0000555589471500(0000) GS:ffff8881256f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7d3db83c00 CR3: 000000005d6e0000 CR4: 0000000000350ef0