================================================================== BUG: KASAN: slab-out-of-bounds in dentry_revalidate+0x12a/0x350 fs/incfs/vfs.c:1554 Read of size 8 at addr ffff88811bfcda10 by task syz-executor/13721 CPU: 0 PID: 13721 Comm: syz-executor Tainted: G W 5.10.234-syzkaller-00023-g3f5f2283d684 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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 dentry_revalidate+0x12a/0x350 fs/incfs/vfs.c:1554 d_revalidate fs/namei.c:780 [inline] lookup_fast+0x481/0x7d0 fs/namei.c:1589 walk_component+0x115/0x610 fs/namei.c:1948 lookup_last fs/namei.c:2403 [inline] path_lookupat+0x16d/0x450 fs/namei.c:2427 filename_lookup+0x26a/0x6f0 fs/namei.c:2460 user_path_at_empty+0x40/0x50 fs/namei.c:2740 user_path_at include/linux/namei.h:60 [inline] vfs_statx+0x106/0x3b0 fs/stat.c:193 vfs_fstatat fs/stat.c:215 [inline] __do_sys_newfstatat fs/stat.c:383 [inline] __se_sys_newfstatat+0xc8/0x760 fs/stat.c:377 __x64_sys_newfstatat+0x9b/0xb0 fs/stat.c:377 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f69369c397a Code: 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 0b 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 90 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 RSP: 002b:00007ffdcd2401a8 EFLAGS: 00000286 ORIG_RAX: 0000000000000106 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f69369c397a RDX: 00007ffdcd2401d0 RSI: 00007ffdcd240260 RDI: 00000000ffffff9c RBP: 00007ffdcd240260 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000286 R12: 00007ffdcd241350 R13: 00007f6936a4608c R14: 0000555559cfe4a8 R15: 00007ffdcd242420 Allocated by task 20073: 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_slab_alloc+0xb1/0xe0 mm/kasan/common.c:463 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 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2779 [inline] f2fs_alloc_inode+0x26/0x420 fs/f2fs/super.c:1373 alloc_inode fs/inode.c:233 [inline] iget_locked+0x14f/0x870 fs/inode.c:1275 f2fs_iget+0x55/0x50a0 fs/f2fs/inode.c:498 f2fs_fill_super+0x63b6/0x7d90 fs/f2fs/super.c:4301 mount_bdev+0x262/0x370 fs/super.c:1442 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4548 legacy_get_tree+0xf1/0x190 fs/fs_context.c:593 vfs_get_tree+0x88/0x290 fs/super.c:1572 do_new_mount+0x2ba/0xb30 fs/namespace.c:2917 path_mount+0x56f/0xcb0 fs/namespace.c:3247 do_mount fs/namespace.c:3260 [inline] __do_sys_mount fs/namespace.c:3468 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3445 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 12: 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] kmem_cache_free+0xa9/0x1e0 mm/slub.c:3219 f2fs_free_inode+0x24/0x30 fs/f2fs/super.c:1528 i_callback+0x4b/0x70 fs/inode.c:222 rcu_do_batch+0x597/0xc40 kernel/rcu/tree.c:2494 rcu_core+0x5ad/0xe40 kernel/rcu/tree.c:2735 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2748 __do_softirq+0x268/0x5bb kernel/softirq.c:309 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2976 [inline] call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3050 destroy_inode fs/inode.c:288 [inline] evict+0x8e8/0x9c0 fs/inode.c:629 iput_final fs/inode.c:1736 [inline] iput+0x632/0x7e0 fs/inode.c:1762 f2fs_put_super+0x5eb/0xb90 fs/f2fs/super.c:1611 generic_shutdown_super+0x147/0x320 fs/super.c:465 kill_block_super+0x7e/0xe0 fs/super.c:1469 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4580 deactivate_locked_super+0xad/0x110 fs/super.c:335 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x129/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2976 [inline] call_rcu+0x135/0x11f0 kernel/rcu/tree.c:3050 destroy_inode fs/inode.c:288 [inline] evict+0x8e8/0x9c0 fs/inode.c:629 dispose_list fs/inode.c:647 [inline] evict_inodes+0x638/0x6c0 fs/inode.c:701 generic_shutdown_super+0x97/0x320 fs/super.c:454 kill_block_super+0x7e/0xe0 fs/super.c:1469 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4580 deactivate_locked_super+0xad/0x110 fs/super.c:335 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x129/0x190 kernel/task_work.c:189 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88811bfcd3b0 which belongs to the cache f2fs_inode_cache of size 1520 The buggy address is located 112 bytes to the right of 1520-byte region [ffff88811bfcd3b0, ffff88811bfcd9a0) The buggy address belongs to the page: page:ffffea00046ff200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811bfc8000 pfn:0x11bfc8 head:ffffea00046ff200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 0000000000000000 0000000100000001 ffff8881029ce180 raw: ffff88811bfc8000 000000008013000b 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 1641, ts 82807500058, free_ts 79237509324 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 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] kmem_cache_alloc+0x1b9/0x2e0 mm/slub.c:2960 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2779 [inline] f2fs_alloc_inode+0x26/0x420 fs/f2fs/super.c:1373 alloc_inode fs/inode.c:233 [inline] new_inode_pseudo+0x64/0x220 fs/inode.c:968 new_inode+0x28/0x1c0 fs/inode.c:997 f2fs_new_inode+0x126/0x14d0 fs/f2fs/namei.c:35 f2fs_create+0x1f9/0x19a0 fs/f2fs/namei.c:357 lookup_open fs/namei.c:3247 [inline] open_last_lookups fs/namei.c:3317 [inline] path_openat+0x1377/0x3000 fs/namei.c:3506 do_filp_open+0x21c/0x460 fs/namei.c:3536 do_sys_openat2+0x13f/0x710 fs/open.c:1217 do_sys_open fs/open.c:1233 [inline] __do_sys_open fs/open.c:1241 [inline] __se_sys_open fs/open.c:1237 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1237 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x82c/0x850 mm/page_alloc.c:1629 free_the_page+0x76/0x370 mm/page_alloc.c:5409 __free_pages+0x67/0xc0 mm/page_alloc.c:5418 __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 shmem_alloc_inode+0x1a/0x30 mm/shmem.c:3816 alloc_inode fs/inode.c:233 [inline] new_inode_pseudo+0x64/0x220 fs/inode.c:968 Memory state around the buggy address: ffff88811bfcd900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811bfcd980: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc >ffff88811bfcda00: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88811bfcda80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811bfcdb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 PID: 13721 Comm: syz-executor Tainted: G B W 5.10.234-syzkaller-00023-g3f5f2283d684 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:mapping_gfp_mask include/linux/pagemap.h:106 [inline] RIP: 0010:grab_cache_page include/linux/pagemap.h:485 [inline] RIP: 0010:f2fs_grab_cache_page fs/f2fs/f2fs.h:2703 [inline] RIP: 0010:__get_node_page+0x114/0xb60 fs/f2fs/node.c:1418 Code: c3 30 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 7e ee 8a ff 4c 89 75 c0 48 8b 1b 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 3f 08 00 00 8b 4b 18 48 89 df 4c 89 ee RSP: 0018:ffffc90000bb76b8 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000000 RCX: ffffffff821d785e RDX: ffff88814745cf00 RSI: 0000000000000004 RDI: 0000000000000018 RBP: ffffc90000bb7710 R08: ffffffff821d6fd7 R09: 0000000000000003 R10: fffff52000176ecc R11: dffffc0000000001 R12: 0000000000000000 R13: 0000000000000004 R14: ffff888125c8a000 R15: dffffc0000000000 FS: 0000555559cfe500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555559d29528 CR3: 000000013944a000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_get_node_page+0x21/0x30 fs/f2fs/node.c:1471 do_read_inode fs/f2fs/inode.c:358 [inline] f2fs_iget+0x6d1/0x50a0 fs/f2fs/inode.c:514 f2fs_lookup+0x446/0xda0 fs/f2fs/namei.c:544 __lookup_slow+0x2b9/0x400 fs/namei.c:1640 lookup_slow+0x5a/0x80 fs/namei.c:1657 walk_component+0x48c/0x610 fs/namei.c:1952 lookup_last fs/namei.c:2403 [inline] path_lookupat+0x16d/0x450 fs/namei.c:2427 filename_lookup+0x26a/0x6f0 fs/namei.c:2460 user_path_at_empty+0x40/0x50 fs/namei.c:2740 user_path_at include/linux/namei.h:60 [inline] ksys_umount fs/namespace.c:1761 [inline] __do_sys_umount fs/namespace.c:1769 [inline] __se_sys_umount fs/namespace.c:1767 [inline] __x64_sys_umount+0xf0/0x170 fs/namespace.c:1767 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f69369c6497 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffdcd23f0b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 00007f6936a4608c RCX: 00007f69369c6497 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdcd23f170 RBP: 00007ffdcd23f170 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdcd240260 R13: 00007f6936a4608c R14: 0000555559cfe4a8 R15: 00007ffdcd242420 Modules linked in: ---[ end trace 55cca66a55548f45 ]--- RIP: 0010:mapping_gfp_mask include/linux/pagemap.h:106 [inline] RIP: 0010:grab_cache_page include/linux/pagemap.h:485 [inline] RIP: 0010:f2fs_grab_cache_page fs/f2fs/f2fs.h:2703 [inline] RIP: 0010:__get_node_page+0x114/0xb60 fs/f2fs/node.c:1418 Code: c3 30 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 7e ee 8a ff 4c 89 75 c0 48 8b 1b 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 0f 85 3f 08 00 00 8b 4b 18 48 89 df 4c 89 ee RSP: 0018:ffffc90000bb76b8 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000000 RCX: ffffffff821d785e RDX: ffff88814745cf00 RSI: 0000000000000004 RDI: 0000000000000018 RBP: ffffc90000bb7710 R08: ffffffff821d6fd7 R09: 0000000000000003 R10: fffff52000176ecc R11: dffffc0000000001 R12: 0000000000000000 R13: 0000000000000004 R14: ffff888125c8a000 R15: dffffc0000000000 FS: 0000555559cfe500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30419ff8 CR3: 000000013944a000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c3 ret 1: 30 48 89 xor %cl,-0x77(%rax) 4: d8 48 c1 fmuls -0x3f(%rax) 7: e8 03 42 80 3c call 0x3c80420f c: 38 00 cmp %al,(%rax) e: 74 08 je 0x18 10: 48 89 df mov %rbx,%rdi 13: e8 7e ee 8a ff call 0xff8aee96 18: 4c 89 75 c0 mov %r14,-0x40(%rbp) 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 8d 7b 18 lea 0x18(%rbx),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 3f 08 00 00 jne 0x876 37: 8b 4b 18 mov 0x18(%rbx),%ecx 3a: 48 89 df mov %rbx,%rdi 3d: 4c 89 ee mov %r13,%rsi