EXT4-fs (loop3): Cannot turn on journaled quota: type 1: error -2
EXT4-fs error (device loop3): ext4_orphan_get:1431: comm syz.3.40: bad orphan inode 15
==================================================================
BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:930 [inline]
BUG: KASAN: use-after-free in enqueue_timer+0xae/0x480 kernel/time/timer.c:611
Write of size 8 at addr ffff8881145924f0 by task syz.3.40/453

CPU: 0 PID: 453 Comm: syz.3.40 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report_generic.c:356
 hlist_add_head include/linux/list.h:930 [inline]
 enqueue_timer+0xae/0x480 kernel/time/timer.c:611
 internal_add_timer kernel/time/timer.c:640 [inline]
 __mod_timer+0x859/0xc00 kernel/time/timer.c:1137
 mod_timer+0x1f/0x30 kernel/time/timer.c:1196
 ext4_update_super+0xa57/0xe30 fs/ext4/super.c:6095
 ext4_commit_super+0xd8/0x4a0 fs/ext4/super.c:6114
 ext4_handle_error+0x6b6/0x870 fs/ext4/super.c:678
 __ext4_error+0x24f/0x440 fs/ext4/super.c:779
 ext4_orphan_get+0x250/0x620 fs/ext4/ialloc.c:1431
 ext4_orphan_cleanup+0xa02/0x1270 fs/ext4/orphan.c:465
 __ext4_fill_super fs/ext4/super.c:5561 [inline]
 ext4_fill_super+0x6a53/0x73e0 fs/ext4/super.c:5680
 get_tree_bdev+0x450/0x6a0 fs/super.c:1371
 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5710
 vfs_get_tree+0x9a/0x270 fs/super.c:1578
 do_new_mount+0x251/0xb40 fs/namespace.c:3081
 path_mount+0x640/0xfd0 fs/namespace.c:3411
 do_mount fs/namespace.c:3424 [inline]
 __do_sys_mount fs/namespace.c:3632 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3609
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3609
 x64_sys_call+0x65d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7a60f9f0ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7a61e8fe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7a61e8fee0 RCX: 00007f7a60f9f0ca
RDX: 0000200000000080 RSI: 0000200000000480 RDI: 00007f7a61e8fea0
RBP: 0000200000000080 R08: 00007f7a61e8fee0 R09: 000000000001008a
R10: 000000000001008a R11: 0000000000000246 R12: 0000200000000480
R13: 00007f7a61e8fea0 R14: 0000000000000455 R15: 000000000000002c
 </TASK>

Allocated by task 344:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 kmalloc_trace+0x40/0xb0 mm/slab_common.c:1033
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 ext4_alloc_sbi fs/ext4/super.c:4315 [inline]
 ext4_fill_super+0x11e/0x73e0 fs/ext4/super.c:5667
 get_tree_bdev+0x450/0x6a0 fs/super.c:1371
 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5710
 vfs_get_tree+0x9a/0x270 fs/super.c:1578
 do_new_mount+0x251/0xb40 fs/namespace.c:3081
 path_mount+0x640/0xfd0 fs/namespace.c:3411
 do_mount fs/namespace.c:3424 [inline]
 __do_sys_mount fs/namespace.c:3632 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3609
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3609
 x64_sys_call+0x65d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 291:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1750 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
 slab_free mm/slub.c:3712 [inline]
 __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
 kfree+0x6f/0xf0 mm/slab_common.c:990
 ext4_put_super+0x9b9/0xab0 fs/ext4/super.c:1363
 generic_shutdown_super+0x16c/0x480 fs/super.c:506
 kill_block_super+0x7f/0xf0 fs/super.c:1475
 deactivate_locked_super+0xb5/0x120 fs/super.c:336
 deactivate_super+0xaf/0xe0 fs/super.c:367
 cleanup_mnt+0x45e/0x4e0 fs/namespace.c:1192
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1199
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888114592000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 1264 bytes inside of
 4096-byte region [ffff888114592000, ffff888114593000)

The buggy address belongs to the physical page:
page:ffffea0004516400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114590
head:ffffea0004516400 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100043380
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
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 344, tgid 337 (syz.2.8), ts 29268461345, free_ts 29268012729
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
 kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 ext4_alloc_sbi fs/ext4/super.c:4315 [inline]
 ext4_fill_super+0x11e/0x73e0 fs/ext4/super.c:5667
 get_tree_bdev+0x450/0x6a0 fs/super.c:1371
 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5710
 vfs_get_tree+0x9a/0x270 fs/super.c:1578
 do_new_mount+0x251/0xb40 fs/namespace.c:3081
 path_mount+0x640/0xfd0 fs/namespace.c:3411
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1580 [inline]
 free_pcp_prepare mm/page_alloc.c:1654 [inline]
 free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621
 free_unref_page+0x93/0x530 mm/page_alloc.c:3719
 free_the_page mm/page_alloc.c:863 [inline]
 free_compound_page+0x99/0xd0 mm/page_alloc.c:886
 destroy_large_folio+0x68/0xa0 mm/page_alloc.c:923
 __folio_put_large mm/swap.c:113 [inline]
 __folio_put+0xd1/0xe0 mm/swap.c:121
 folio_put include/linux/mm.h:1442 [inline]
 put_page include/linux/mm.h:1494 [inline]
 __skb_frag_unref include/linux/skbuff.h:3510 [inline]
 skb_release_data+0x3d5/0x8a0 net/core/skbuff.c:788
 skb_release_all net/core/skbuff.c:859 [inline]
 __kfree_skb+0x50/0x70 net/core/skbuff.c:873
 tcp_wmem_free_skb include/net/tcp.h:308 [inline]
 tcp_rtx_queue_unlink_and_free+0x40c/0x650 include/net/tcp.h:1979
 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3415 [inline]
 tcp_ack+0x1de9/0x5f40 net/ipv4/tcp_input.c:3974
 tcp_rcv_established+0xdb9/0x1ab0 net/ipv4/tcp_input.c:6027
 tcp_v4_do_rcv+0x446/0x9c0 net/ipv4/tcp_ipv4.c:1684
 tcp_v4_rcv+0x239f/0x2ae0 net/ipv4/tcp_ipv4.c:2115
 ip_protocol_deliver_rcu+0x371/0x780 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x23e/0x400 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip_local_deliver+0x1dc/0x350 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:463 [inline]
 ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline]
 ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline]
 ip_sublist_rcv+0x787/0x8d0 net/ipv4/ip_input.c:639

Memory state around the buggy address:
 ffff888114592380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888114592400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888114592480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff888114592500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888114592580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
EXT4-fs (loop3): Remounting filesystem read-only
ext4_test_bit(bit=14, block=4) = 1
is_bad_inode(inode)=0
NEXT_ORPHAN(inode)=0
max_ino=32
i_nlink=1
EXT4-fs (loop3): mounted filesystem without journal. Quota mode: writeback.