EXT4-fs error (device loop4): ext4_map_blocks:607: inode #2: block 3: comm syz-executor: lblock 0 mapped to illegal pblock 3 (length 1) ================================================================== 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 ffff8881160e24c0 by task syz-executor/1458 CPU: 0 PID: 1458 Comm: syz-executor Not tainted 6.1.84-syzkaller-00010-gfc94b39f6687 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 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 __mod_timer+0x83d/0xcf0 kernel/time/timer.c:1119 mod_timer+0x1f/0x30 kernel/time/timer.c:1172 ext4_update_super+0xa41/0xe50 fs/ext4/super.c:6043 ext4_commit_super+0xe3/0x4b0 fs/ext4/super.c:6062 ext4_handle_error+0x5e1/0x890 fs/ext4/super.c:678 __ext4_error_inode+0x327/0x5e0 fs/ext4/super.c:810 ext4_map_blocks+0xacb/0x1ca0 ext4_readdir+0x87a/0x3930 fs/ext4/dir.c:181 iterate_dir+0x265/0x610 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x1c1/0x460 fs/readdir.c:354 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbdb31a7bf3 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 f2 44 f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 RSP: 002b:00007ffd77628798 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00005555565734e0 RCX: 00007fbdb31a7bf3 RDX: 0000000000008000 RSI: 00005555565734e0 RDI: 0000000000000005 RBP: 00005555565734b4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000010 R14: 00005555565734b0 R15: 0000000000018788 Allocated by task 2228: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:388 kasan_kmalloc include/linux/kasan.h:212 [inline] kmalloc_trace+0x44/0xa0 mm/slab_common.c:1052 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:692 [inline] ext4_alloc_sbi fs/ext4/super.c:4264 [inline] ext4_fill_super+0x102/0x8460 fs/ext4/super.c:5638 get_tree_bdev+0x440/0x680 fs/super.c:1357 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5681 vfs_get_tree+0x88/0x290 fs/super.c:1564 do_new_mount+0x2ba/0xb30 fs/namespace.c:3051 path_mount+0x671/0x1070 fs/namespace.c:3381 do_mount fs/namespace.c:3394 [inline] __do_sys_mount fs/namespace.c:3602 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3579 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3579 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 2122: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x131/0x180 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 mm/slub.c:1771 [inline] slab_free mm/slub.c:3684 [inline] __kmem_cache_free+0x218/0x3b0 mm/slub.c:3697 kfree+0x7a/0xf0 mm/slab_common.c:1009 ext4_put_super+0x9e5/0xd60 fs/ext4/super.c:1312 generic_shutdown_super+0x14f/0x370 fs/super.c:503 kill_block_super+0x7e/0xe0 fs/super.c:1461 deactivate_locked_super+0xad/0x110 fs/super.c:334 deactivate_super+0xbe/0xf0 fs/super.c:365 cleanup_mnt+0x485/0x510 fs/namespace.c:1186 __cleanup_mnt+0x19/0x20 fs/namespace.c:1193 task_work_run+0x24d/0x2e0 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xbd5/0x2b80 kernel/exit.c:875 do_group_exit+0x21a/0x2d0 kernel/exit.c:1025 __do_sys_exit_group kernel/exit.c:1036 [inline] __se_sys_exit_group kernel/exit.c:1034 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1034 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff8881160e2000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1216 bytes inside of 4096-byte region [ffff8881160e2000, ffff8881160e3000) The buggy address belongs to the physical page: page:ffffea0004583800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1160e0 head:ffffea0004583800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0004562a00 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 107, tgid 107 (udevd), ts 4636716764, free_ts 0 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+0x27ea/0x2870 mm/page_alloc.c:4425 __alloc_pages+0x3a1/0x780 mm/page_alloc.c:5714 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+0x1af/0x250 mm/slub.c:3460 kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1047 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:692 [inline] uevent_show+0x155/0x310 drivers/base/core.c:2641 dev_attr_show+0x56/0xd0 drivers/base/core.c:2349 sysfs_kf_seq_show+0x27c/0x3a0 fs/sysfs/file.c:59 kernfs_seq_show+0x119/0x160 fs/kernfs/file.c:201 seq_read_iter+0x430/0xd00 fs/seq_file.c:230 kernfs_fop_read_iter+0x145/0x470 fs/kernfs/file.c:275 page_owner free stack trace missing Memory state around the buggy address: ffff8881160e2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881160e2400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881160e2480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881160e2500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881160e2580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== EXT4-fs error (device loop4) in ext4_reserve_inode_write:5870: Corrupt filesystem EXT4-fs error (device loop4): ext4_dirty_inode:6074: inode #2: comm syz-executor: mark_inode_dirty error EXT4-fs (loop4): unmounting filesystem. EXT4-fs error (device loop4) in ext4_reserve_inode_write:5870: Corrupt filesystem EXT4-fs error (device loop4): ext4_quota_off:7041: inode #3: comm syz-executor: mark_inode_dirty error EXT4-fs error (device loop4) in ext4_reserve_inode_write:5870: Corrupt filesystem EXT4-fs error (device loop4): ext4_quota_off:7041: inode #4: comm syz-executor: mark_inode_dirty error