loop8: detected capacity change from 0 to 512 EXT4-fs: Warning: mounting with an experimental mount option 'dioread_nolock' for blocksize < PAGE_SIZE EXT4-fs: Journaled quota options ignored when QUOTA feature is enabled EXT4-fs error (device loop8): ext4_get_branch:178: inode #11: block 4294967295: comm syz.8.2489: invalid block ================================================================== 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 ffff88811f2004c0 by task syz.8.2489/11603 CPU: 1 PID: 11603 Comm: syz.8.2489 Not tainted 6.1.141-syzkaller-00039-g145c7fad733f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x71/0x210 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:427 kasan_report+0x122/0x150 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+0xae/0x480 kernel/time/timer.c:611 __mod_timer+0x79f/0xb30 kernel/time/timer.c:-1 mod_timer+0x1f/0x30 kernel/time/timer.c:1172 ext4_update_super+0xa54/0xe40 fs/ext4/super.c:6068 ext4_commit_super+0xe3/0x4b0 fs/ext4/super.c:6087 ext4_handle_error+0x5c8/0x860 fs/ext4/super.c:678 __ext4_error_inode+0x2ce/0x560 fs/ext4/super.c:811 ext4_check_blockref+0x1c6/0x1d0 fs/ext4/block_validity.c:363 ext4_get_branch+0x424/0x7c0 fs/ext4/indirect.c:178 ext4_ind_map_blocks+0x255/0x1f30 fs/ext4/indirect.c:554 ext4_map_blocks+0x373/0x1b60 fs/ext4/inode.c:608 _ext4_get_block+0x1da/0x4e0 fs/ext4/inode.c:822 ext4_get_block fs/ext4/inode.c:839 [inline] __ext4_block_zero_page_range fs/ext4/inode.c:3790 [inline] ext4_block_zero_page_range+0x396/0x9e0 fs/ext4/inode.c:3870 ext4_block_truncate_page fs/ext4/inode.c:3894 [inline] ext4_truncate+0x8c3/0xf90 fs/ext4/inode.c:4271 ext4_process_orphan+0x1d9/0x320 fs/ext4/orphan.c:339 ext4_orphan_cleanup+0xb02/0x1210 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5522 [inline] ext4_fill_super+0x73e6/0x7930 fs/ext4/super.c:5653 get_tree_bdev+0x444/0x680 fs/super.c:1368 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5683 vfs_get_tree+0x9a/0x270 fs/super.c:1575 do_new_mount+0x25a/0xa20 fs/namespace.c:3054 path_mount+0x675/0x1010 fs/namespace.c:3384 do_mount fs/namespace.c:3397 [inline] __do_sys_mount fs/namespace.c:3605 [inline] __se_sys_mount+0x318/0x380 fs/namespace.c:3582 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3582 x64_sys_call+0x65d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f2cfbb9014a 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:00007f2cfb9dde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2cfb9ddef0 RCX: 00007f2cfbb9014a RDX: 0000200000000700 RSI: 0000200000000080 RDI: 00007f2cfb9ddeb0 RBP: 0000200000000700 R08: 00007f2cfb9ddef0 R09: 0000000000008052 R10: 0000000000008052 R11: 0000000000000246 R12: 0000200000000080 R13: 00007f2cfb9ddeb0 R14: 00000000000004de R15: 0000200000000380 Allocated by task 11516: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:388 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:4260 [inline] ext4_fill_super+0x107/0x7930 fs/ext4/super.c:5640 get_tree_bdev+0x444/0x680 fs/super.c:1368 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5683 vfs_get_tree+0x9a/0x270 fs/super.c:1575 do_new_mount+0x25a/0xa20 fs/namespace.c:3054 path_mount+0x675/0x1010 fs/namespace.c:3384 do_mount fs/namespace.c:3397 [inline] __do_sys_mount fs/namespace.c:3605 [inline] __se_sys_mount+0x318/0x380 fs/namespace.c:3582 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3582 x64_sys_call+0x65d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 286: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x31/0x50 mm/kasan/generic.c:516 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:241 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1745 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1771 slab_free mm/slub.c:3686 [inline] __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3702 kfree+0x6f/0xf0 mm/slab_common.c:990 ext4_put_super+0x9b6/0xac0 fs/ext4/super.c:1313 generic_shutdown_super+0x15f/0x370 fs/super.c:503 kill_block_super+0x7f/0xf0 fs/super.c:1472 deactivate_locked_super+0xb5/0x120 fs/super.c:334 deactivate_super+0xaf/0xe0 fs/super.c:365 cleanup_mnt+0x45f/0x4e0 fs/namespace.c:1182 __cleanup_mnt+0x19/0x20 fs/namespace.c:1189 task_work_run+0x1db/0x240 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0xa1d/0x2650 kernel/exit.c:877 do_group_exit+0x210/0x2d0 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 x64_sys_call+0x7b4/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88811f200000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1216 bytes inside of 4096-byte region [ffff88811f200000, ffff88811f201000) The buggy address belongs to the physical page: page:ffffea00047c8000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f200 head:ffffea00047c8000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0004a3f000 dead000000000002 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 3729, tgid 3729 (syz-executor), ts 406063913851, free_ts 406048793523 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2637 prep_new_page+0x1c/0x110 mm/page_alloc.c:2644 get_page_from_freelist+0x2c7b/0x2cf0 mm/page_alloc.c:4539 __alloc_pages+0x19e/0x3a0 mm/page_alloc.c:5850 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1962 [inline] new_slab+0x98/0x3d0 mm/slub.c:2015 ___slab_alloc+0x6f6/0xb50 mm/slub.c:3203 __slab_alloc+0x5e/0xa0 mm/slub.c:3302 slab_alloc_node mm/slub.c:3387 [inline] __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3462 kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] kobject_uevent_env+0x287/0x730 lib/kobject_uevent.c:539 kobject_uevent+0x1d/0x30 lib/kobject_uevent.c:657 __kobject_del+0xd7/0x2f0 lib/kobject.c:593 kobject_cleanup lib/kobject.c:672 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1ee/0x280 lib/kobject.c:729 net_rx_queue_update_kobjects+0x45c/0x4d0 net/core/net-sysfs.c:1122 netif_set_real_num_rx_queues+0x107/0x1f0 net/core/dev.c:3007 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1545 [inline] free_pcp_prepare mm/page_alloc.c:1619 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3581 free_unref_page+0x8f/0x530 mm/page_alloc.c:3677 free_the_page mm/page_alloc.c:830 [inline] __free_pages+0x67/0x100 mm/page_alloc.c:5939 __free_slab+0xca/0x1a0 mm/slub.c:2039 free_slab mm/slub.c:2054 [inline] discard_slab mm/slub.c:2060 [inline] __unfreeze_partials+0x160/0x190 mm/slub.c:2609 put_cpu_partial+0xa9/0x100 mm/slub.c:2685 __slab_free+0x1c4/0x280 mm/slub.c:3563 do_slab_free mm/slub.c:3640 [inline] ___cache_free+0xbf/0xd0 mm/slub.c:3696 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0xc6/0x140 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x14a/0x170 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+0x4f/0x2d0 mm/slab.h:768 slab_alloc_node mm/slub.c:3421 [inline] __kmem_cache_alloc_node+0x192/0x2c0 mm/slub.c:3462 kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028 kmalloc include/linux/slab.h:563 [inline] netdev_name_node_alloc net/core/dev.c:260 [inline] netdev_name_node_head_alloc net/core/dev.c:274 [inline] register_netdevice+0x2c1/0x14a0 net/core/dev.c:10080 veth_newlink+0x7a0/0xbe0 drivers/net/veth.c:1775 Memory state around the buggy address: ffff88811f200380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811f200400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811f200480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811f200500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811f200580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== EXT4-fs error (device loop8): ext4_free_branches:1030: inode #11: comm syz.8.2489: invalid indirect mapped block 4294967295 (level 1) EXT4-fs error (device loop8): ext4_free_branches:1030: inode #11: comm syz.8.2489: invalid indirect mapped block 4294967295 (level 1) EXT4-fs (loop8): 2 truncates cleaned up EXT4-fs (loop8): mounted filesystem without journal. Quota mode: writeback.