EXT4-fs (loop8): orphan cleanup on readonly fs Quota error (device loop8): find_tree_dqentry: Cycle in quota tree detected: block 1 index 0 Quota error (device loop8): qtree_read_dquot: Can't read quota structure for id 0 EXT4-fs error (device loop8): ext4_acquire_dquot:6788: comm syz.8.1083: Failed to acquire dquot type 0 ================================================================== BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:930 [inline] BUG: KASAN: use-after-free in enqueue_timer+0xa6/0x480 kernel/time/timer.c:611 Write of size 8 at addr ffff8881159264c0 by task syz.8.1083/4636 CPU: 0 PID: 4636 Comm: syz.8.1083 Not tainted 6.1.118-syzkaller-00078-ge2b9748880b9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x158/0x4e0 mm/kasan/report.c:427 kasan_report+0x13c/0x170 mm/kasan/report.c:531 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report_generic.c:356 hlist_add_head include/linux/list.h:930 [inline] enqueue_timer+0xa6/0x480 kernel/time/timer.c:611 internal_add_timer kernel/time/timer.c:640 [inline] __mod_timer+0x8d3/0xcf0 kernel/time/timer.c:1121 mod_timer+0x1f/0x30 kernel/time/timer.c:1172 ext4_update_super+0xa41/0xe50 fs/ext4/super.c:6067 ext4_commit_super+0xe3/0x4b0 fs/ext4/super.c:6086 ext4_handle_error+0x5d8/0x870 fs/ext4/super.c:678 __ext4_error+0x260/0x480 fs/ext4/super.c:779 ext4_acquire_dquot+0x35e/0x4a0 fs/ext4/super.c:6786 dqget+0x745/0xeb0 fs/quota/dquot.c:986 __dquot_initialize+0x2d9/0xde0 fs/quota/dquot.c:1515 dquot_initialize+0x1a/0x20 fs/quota/dquot.c:1577 ext4_process_orphan+0x59/0x2f0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0xa50/0x11b0 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5521 [inline] ext4_fill_super+0x7d46/0x8460 fs/ext4/super.c:5652 get_tree_bdev+0x440/0x680 fs/super.c:1368 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5682 vfs_get_tree+0x88/0x290 fs/super.c:1575 do_new_mount+0x2ba/0xb30 fs/namespace.c:3056 path_mount+0x671/0x1070 fs/namespace.c:3386 do_mount fs/namespace.c:3399 [inline] __do_sys_mount fs/namespace.c:3607 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3584 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3584 x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f779f9874ca Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f77a0723e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f77a0723ef0 RCX: 00007f779f9874ca RDX: 0000000020000080 RSI: 0000000020000140 RDI: 00007f77a0723eb0 RBP: 0000000020000080 R08: 00007f77a0723ef0 R09: 0000000002000040 R10: 0000000002000040 R11: 0000000000000246 R12: 0000000020000140 R13: 00007f77a0723eb0 R14: 00000000000004dc R15: 000000000000002c The buggy address belongs to the physical page: page:ffffea0004564980 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115926 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 0000000000000000 ffffea0004564988 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 103, tgid 103 (udevd), ts 202155392926, free_ts 315602587729 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597 get_page_from_freelist+0x2f41/0x2fc0 mm/page_alloc.c:4462 __alloc_pages+0x234/0x610 mm/page_alloc.c:5759 alloc_slab_page+0x6c/0xf0 allocate_slab mm/slub.c:1962 [inline] new_slab+0x90/0x3e0 mm/slub.c:2015 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3203 __slab_alloc+0x5d/0xa0 mm/slub.c:3302 slab_alloc_node mm/slub.c:3387 [inline] __kmem_cache_alloc_node+0x207/0x2a0 mm/slub.c:3462 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc_node+0xa3/0x1e0 mm/slab_common.c:945 kmalloc_node include/linux/slab.h:583 [inline] kvmalloc_node+0x221/0x640 mm/util.c:592 kvmalloc include/linux/slab.h:710 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x1ff/0xd00 fs/seq_file.c:210 kernfs_fop_read_iter+0x145/0x470 fs/kernfs/file.c:279 call_read_iter include/linux/fs.h:2268 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x801/0xae0 fs/read_write.c:470 ksys_read+0x199/0x2c0 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:621 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1498 [inline] free_pcp_prepare mm/page_alloc.c:1572 [inline] free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3511 free_unref_page+0xb2/0x5c0 mm/page_alloc.c:3607 free_the_page mm/page_alloc.c:798 [inline] __free_pages+0x61/0xf0 mm/page_alloc.c:5848 __free_slab+0xce/0x1a0 mm/slub.c:2039 free_slab mm/slub.c:2054 [inline] discard_slab+0x29/0x40 mm/slub.c:2060 __slab_free+0x205/0x280 mm/slub.c:3599 do_slab_free mm/slub.c:3640 [inline] ___cache_free+0xc6/0xd0 mm/slub.c:3696 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0xc5/0x140 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:310 kasan_slab_alloc include/linux/kasan.h:202 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:768 slab_alloc_node mm/slub.c:3421 [inline] slab_alloc mm/slub.c:3431 [inline] __kmem_cache_alloc_lru mm/slub.c:3438 [inline] kmem_cache_alloc+0x175/0x320 mm/slub.c:3447 kmem_cache_zalloc include/linux/slab.h:683 [inline] taskstats_tgid_alloc kernel/taskstats.c:583 [inline] taskstats_exit+0x211/0xb50 kernel/taskstats.c:622 do_exit+0x9f7/0x2b80 kernel/exit.c:862 do_group_exit+0x21a/0x2d0 kernel/exit.c:1027 __do_sys_exit_group kernel/exit.c:1038 [inline] __se_sys_exit_group kernel/exit.c:1036 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1036 Memory state around the buggy address: ffff888115926380: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888115926400: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888115926480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888115926500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888115926580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs (loop8): Remounting filesystem read-only Quota error (device loop8): find_tree_dqentry: Cycle in quota tree detected: block 1 index 0 Quota error (device loop8): qtree_read_dquot: Can't read quota structure for id 0 EXT4-fs error (device loop8): ext4_acquire_dquot:6788: comm syz.8.1083: Failed to acquire dquot type 0 EXT4-fs (loop8): Remounting filesystem read-only Quota error (device loop8): find_tree_dqentry: Cycle in quota tree detected: block 1 index 0 Quota error (device loop8): qtree_read_dquot: Can't read quota structure for id 0 EXT4-fs error (device loop8): ext4_acquire_dquot:6788: comm syz.8.1083: Failed to acquire dquot type 0 EXT4-fs (loop8): Remounting filesystem read-only EXT4-fs (loop8): 1 orphan inode deleted EXT4-fs (loop8): mounted filesystem without journal. Quota mode: writeback.