================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0x84/0x120 lib/list_debug.c:59 Read of size 8 at addr ffff88811f3744c0 by task kworker/u4:5/13147 CPU: 0 PID: 13147 Comm: kworker/u4:5 Not tainted 5.10.178-syzkaller-00127-g43c801dc3325 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Workqueue: writeback wb_workfn (flush-7:1) Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 __list_del_entry_valid+0x84/0x120 lib/list_debug.c:59 __list_del_entry include/linux/list.h:132 [inline] list_del_init include/linux/list.h:204 [inline] __remove_dirty_inode fs/f2fs/checkpoint.c:1031 [inline] f2fs_remove_dirty_inode+0x211/0x400 fs/f2fs/checkpoint.c:1067 __f2fs_write_data_pages fs/f2fs/data.c:3243 [inline] f2fs_write_data_pages+0x241a/0x2c90 fs/f2fs/data.c:3257 do_writepages+0x12e/0x270 mm/page-writeback.c:2358 __writeback_single_inode+0xd7/0xac0 fs/fs-writeback.c:1467 writeback_sb_inodes+0x99c/0x16b0 fs/fs-writeback.c:1730 wb_writeback+0x404/0xc60 fs/fs-writeback.c:1905 wb_do_writeback fs/fs-writeback.c:2050 [inline] wb_workfn+0x3d9/0x1110 fs/fs-writeback.c:2091 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2298 worker_thread+0xaea/0x1510 kernel/workqueue.c:2444 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 :299 Allocated by task 93: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x18a/0x2e0 mm/slub.c:2974 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:664 [inline] kernfs_iop_get_link+0x67/0x580 fs/kernfs/symlink.c:135 vfs_readlink+0x16a/0x400 fs/namei.c:4701 do_readlinkat+0x27f/0x3a0 fs/stat.c:426 __do_sys_readlink fs/stat.c:447 [inline] __se_sys_readlink fs/stat.c:444 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:444 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 Freed by task 93: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1595 [inline] slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621 slab_free mm/slub.c:3203 [inline] kfree+0xc3/0x270 mm/slub.c:4191 kfree_link+0x15/0x20 fs/libfs.c:1220 do_delayed_call include/linux/delayed_call.h:28 [inline] vfs_readlink+0x23e/0x400 fs/namei.c:4706 do_readlinkat+0x27f/0x3a0 fs/stat.c:426 __do_sys_readlink fs/stat.c:447 [inline] __se_sys_readlink fs/stat.c:444 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:444 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 The buggy address belongs to the object at ffff88811f374000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1216 bytes inside of 4096-byte region [ffff88811f374000, ffff88811f375000) The buggy address belongs to the page: page:ffffea00047cdc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f370 head:ffffea00047cdc00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042c00 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 506, ts 213731526194, free_ts 213707235908 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2455 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2461 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4253 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5345 allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc+0x204/0x330 mm/slub.c:4029 __kmalloc_node include/linux/slab.h:418 [inline] kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x82/0x130 mm/util.c:612 kvmalloc include/linux/mm.h:822 [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:241 call_read_iter include/linux/fs.h:1970 [inline] new_sync_read fs/read_write.c:415 [inline] vfs_read+0x999/0xbb0 fs/read_write.c:496 ksys_read+0x199/0x2c0 fs/read_write.c:634 __do_sys_read fs/read_write.c:644 [inline] __se_sys_read fs/read_write.c:642 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:642 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1348 [inline] __free_pages_ok+0x82c/0x850 mm/page_alloc.c:1628 free_the_page+0x76/0x370 mm/page_alloc.c:5406 __free_pages+0x67/0xc0 mm/page_alloc.c:5415 __free_slab+0xcf/0x190 mm/slub.c:1894 free_slab mm/slub.c:1909 [inline] discard_slab mm/slub.c:1915 [inline] unfreeze_partials+0x15e/0x190 mm/slub.c:2410 put_cpu_partial+0xbf/0x180 mm/slub.c:2446 __slab_free+0x2c8/0x3a0 mm/slub.c:3095 do_slab_free mm/slub.c:3191 [inline] ___cache_free+0x111/0x130 mm/slub.c:3210 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x47/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x15a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583 slab_alloc_node mm/slub.c:2947 [inline] slab_alloc mm/slub.c:2955 [inline] kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960 getname_flags+0xba/0x520 fs/namei.c:141 getname+0x19/0x20 fs/namei.c:212 Memory state around the buggy address: ffff88811f374380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811f374400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811f374480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811f374500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811f374580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== list_del corruption. prev->next should be ffff88816dec96f0, but was 0000000000000000 ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:61! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 13147 Comm: kworker/u4:5 Tainted: G B 5.10.178-syzkaller-00127-g43c801dc3325 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Workqueue: writeback wb_workfn (flush-7:1) RIP: 0010:__list_del_entry_valid+0x10c/0x120 lib/list_debug.c:59 Code: 4c 89 f6 e8 b5 91 53 02 0f 0b 48 c7 c7 20 f4 5f 85 4c 89 f6 e8 a4 91 53 02 0f 0b 48 c7 c7 80 f4 5f 85 4c 89 f6 e8 93 91 53 02 <0f> 0b 48 c7 c7 e0 f4 5f 85 4c 89 f6 e8 82 91 53 02 0f 0b cc 55 48 RSP: 0000:ffffc90000156fe0 EFLAGS: 00010246 RAX: 0000000000000054 RBX: ffff88811f3744c0 RCX: e2485615cf3e3a00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000157000 R08: ffffffff8151fdf8 R09: fffff5200002ad15 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff8881100b2500 R14: ffff88816dec96f0 R15: ffff88811f3744c0 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fac4ddea000 CR3: 000000015a640000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:132 [inline] list_del_init include/linux/list.h:204 [inline] __remove_dirty_inode fs/f2fs/checkpoint.c:1031 [inline] f2fs_remove_dirty_inode+0x211/0x400 fs/f2fs/checkpoint.c:1067 __f2fs_write_data_pages fs/f2fs/data.c:3243 [inline] f2fs_write_data_pages+0x241a/0x2c90 fs/f2fs/data.c:3257 do_writepages+0x12e/0x270 mm/page-writeback.c:2358 __writeback_single_inode+0xd7/0xac0 fs/fs-writeback.c:1467 writeback_sb_inodes+0x99c/0x16b0 fs/fs-writeback.c:1730 wb_writeback+0x404/0xc60 fs/fs-writeback.c:1905 wb_do_writeback fs/fs-writeback.c:2050 [inline] wb_workfn+0x3d9/0x1110 fs/fs-writeback.c:2091 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2298 worker_thread+0xaea/0x1510 kernel/workqueue.c:2444 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 :299 Modules linked in: ---[ end trace 279666779ea1901d ]--- RIP: 0010:__list_del_entry_valid+0x10c/0x120 lib/list_debug.c:59 Code: 4c 89 f6 e8 b5 91 53 02 0f 0b 48 c7 c7 20 f4 5f 85 4c 89 f6 e8 a4 91 53 02 0f 0b 48 c7 c7 80 f4 5f 85 4c 89 f6 e8 93 91 53 02 <0f> 0b 48 c7 c7 e0 f4 5f 85 4c 89 f6 e8 82 91 53 02 0f 0b cc 55 48 RSP: 0000:ffffc90000156fe0 EFLAGS: 00010246 RAX: 0000000000000054 RBX: ffff88811f3744c0 RCX: e2485615cf3e3a00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000157000 R08: ffffffff8151fdf8 R09: fffff5200002ad15 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: ffff8881100b2500 R14: ffff88816dec96f0 R15: ffff88811f3744c0 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fac4ddea000 CR3: 000000015a640000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400