RBP: 00007f16653e7c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f16655f5038 R14: 00007f16655f4fa0 R15: 00007ffe04dfcf48 ---[ end trace b1a0e0c72323178e ]--- ================================================================== BUG: KASAN: slab-out-of-bounds in __set_sit_entry_type fs/f2fs/segment.c:2257 [inline] BUG: KASAN: slab-out-of-bounds in reset_curseg+0x4dd/0x560 fs/f2fs/segment.c:2663 Read of size 4 at addr ffff8881290c33c0 by task syz.2.902/2810 CPU: 0 PID: 2810 Comm: syz.2.902 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 __set_sit_entry_type fs/f2fs/segment.c:2257 [inline] reset_curseg+0x4dd/0x560 fs/f2fs/segment.c:2663 new_curseg+0x12e8/0x1880 fs/f2fs/segment.c:2723 __allocate_new_segment+0x13d/0x810 fs/f2fs/segment.c:3039 __allocate_new_section fs/f2fs/segment.c:3047 [inline] f2fs_allocate_new_section+0x1f3/0x290 fs/f2fs/segment.c:3054 expand_inode_data+0x5f7/0x9a0 fs/f2fs/file.c:1760 f2fs_fallocate+0x42b/0x7e0 fs/f2fs/file.c:1865 vfs_fallocate+0x4b4/0x590 fs/open.c:310 ioctl_preallocate fs/ioctl.c:494 [inline] file_ioctl fs/ioctl.c:534 [inline] do_vfs_ioctl+0x1154/0x14c0 fs/ioctl.c:732 __do_sys_ioctl fs/ioctl.c:751 [inline] __se_sys_ioctl+0x9f/0x1a0 fs/ioctl.c:739 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f1665379eb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f1663dd6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f16655f4fa0 RCX: 00007f1665379eb9 RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000005 RBP: 00007f16653e7c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f16655f5038 R14: 00007f16655f4fa0 R15: 00007ffe04dfcf48 Allocated by task 2810: 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 mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1a4/0x330 mm/slub.c:4038 __kmalloc_node include/linux/slab.h:421 [inline] kmalloc_node include/linux/slab.h:578 [inline] kvmalloc_node+0x88/0x130 mm/util.c:612 kvmalloc include/linux/mm.h:833 [inline] f2fs_kvmalloc fs/f2fs/f2fs.h:3375 [inline] f2fs_kvzalloc fs/f2fs/f2fs.h:3381 [inline] build_sit_info fs/f2fs/segment.c:4395 [inline] f2fs_build_segment_manager+0xdba/0x4900 fs/f2fs/segment.c:5258 f2fs_fill_super+0x4a4a/0x7300 fs/f2fs/super.c:4315 mount_bdev+0x28b/0x3a0 fs/super.c:1442 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4599 legacy_get_tree+0xed/0x190 fs/fs_context.c:593 vfs_get_tree+0x89/0x260 fs/super.c:1572 do_new_mount+0x25a/0xa20 fs/namespace.c:3006 path_mount+0x585/0xc90 fs/namespace.c:3336 do_mount fs/namespace.c:3349 [inline] __do_sys_mount fs/namespace.c:3557 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3534 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu kernel/rcu/tree.c:2980 [inline] call_rcu+0x11a/0x10b0 kernel/rcu/tree.c:3054 in6_dev_finish_destroy+0x147/0x180 net/ipv6/addrconf_core.c:271 in6_dev_put include/net/addrconf.h:420 [inline] addrconf_ifdown+0x165c/0x1850 net/ipv6/addrconf.c:3943 addrconf_notify+0x3bd/0xe90 net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2054 [inline] call_netdevice_notifiers_extack net/core/dev.c:2066 [inline] call_netdevice_notifiers net/core/dev.c:2080 [inline] unregister_netdevice_many+0x1074/0x1a80 net/core/dev.c:10767 default_device_exit_batch+0x35e/0x3c0 net/core/dev.c:11287 ops_exit_list net/core/net_namespace.c:190 [inline] cleanup_net+0x603/0xb80 net/core/net_namespace.c:609 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13c0 kernel/workqueue.c:2447 kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff8881290c3000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 960 bytes inside of 1024-byte region [ffff8881290c3000, ffff8881290c3400) The buggy address belongs to the page: page:ffffea0004a43000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1290c0 head:ffffea0004a43000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea00049e9800 0000000700000007 ffff888100042f00 raw: 0000000000000000 0000000000100010 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 357, ts 29467851375, free_ts 28859694132 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x223b/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x290/0x620 mm/page_alloc.c:5370 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc_track_caller+0x1ec/0x320 mm/slub.c:4541 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xdc/0x520 net/core/skbuff.c:212 alloc_skb include/linux/skbuff.h:1126 [inline] alloc_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline] kobject_uevent_net_broadcast+0x1a6/0x5a0 lib/kobject_uevent.c:412 kobject_uevent_env+0x52e/0x700 lib/kobject_uevent.c:608 kobject_uevent+0x1d/0x30 lib/kobject_uevent.c:657 netdev_queue_add_kobject net/core/net-sysfs.c:1660 [inline] netdev_queue_update_kobjects+0x1a7/0x390 net/core/net-sysfs.c:1694 register_queue_kobjects net/core/net-sysfs.c:1755 [inline] netdev_register_kobject+0x2af/0x360 net/core/net-sysfs.c:2001 register_netdevice+0xdf0/0x13e0 net/core/dev.c:10056 br_dev_newlink+0x27/0x110 net/bridge/br_netlink.c:1370 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+0x80b/0x830 mm/page_alloc.c:1629 free_compound_page+0x73/0x90 mm/page_alloc.c:710 free_transhuge_page+0x20c/0x230 mm/huge_memory.c:2783 destroy_compound_page include/linux/mm.h:970 [inline] __put_compound_page mm/swap.c:117 [inline] release_pages+0x3db/0xea0 mm/swap.c:1074 __pagevec_release+0x71/0xe0 mm/swap.c:1123 pagevec_release include/linux/pagevec.h:88 [inline] shmem_undo_range+0x74a/0x1810 mm/shmem.c:969 shmem_truncate_range mm/shmem.c:1073 [inline] shmem_evict_inode+0x210/0xa00 mm/shmem.c:1173 evict+0x4ae/0x930 fs/inode.c:612 iput_final fs/inode.c:1736 [inline] iput+0x638/0x7c0 fs/inode.c:1762 dentry_unlink_inode+0x2cf/0x380 fs/dcache.c:378 __dentry_kill+0x44f/0x650 fs/dcache.c:583 shrink_dentry_list+0x38e/0x500 fs/dcache.c:1146 shrink_dcache_parent+0xa9/0x270 fs/dcache.c:-1 do_one_tree+0x27/0x150 fs/dcache.c:1627 shrink_dcache_for_umount+0x6a/0x110 fs/dcache.c:1644 generic_shutdown_super+0x66/0x320 fs/super.c:447 Memory state around the buggy address: ffff8881290c3280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881290c3300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881290c3380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff8881290c3400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881290c3480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 2810 Comm: syz.2.902 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:update_sit_entry+0x3eb/0xf50 fs/f2fs/segment.c:-1 Code: 89 45 a8 49 01 c5 41 f6 d7 41 80 e7 07 44 89 f9 41 bf 01 00 00 00 41 d3 e7 4d 89 ee 49 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 06 84 c0 0f 85 a5 08 00 00 41 0f b6 5d 00 44 89 f8 41 RSP: 0018:ffffc90000f7f330 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8881290c33c8 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881290c33c8 RBP: ffffc90000f7f3b0 R08: ffff88811defbb40 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000002 R12: 0000000000004000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000080 FS: 00007f1663dd66c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001180 CR3: 0000000115f0d000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_allocate_data_block+0x159c/0x3a20 fs/f2fs/segment.c:3481 __allocate_data_block+0x553/0x9d0 fs/f2fs/data.c:1407 f2fs_map_blocks+0xda4/0x35a0 fs/f2fs/data.c:1575 expand_inode_data+0x626/0x9a0 fs/f2fs/file.c:1764 f2fs_fallocate+0x42b/0x7e0 fs/f2fs/file.c:1865 vfs_fallocate+0x4b4/0x590 fs/open.c:310 ioctl_preallocate fs/ioctl.c:494 [inline] file_ioctl fs/ioctl.c:534 [inline] do_vfs_ioctl+0x1154/0x14c0 fs/ioctl.c:732 __do_sys_ioctl fs/ioctl.c:751 [inline] __se_sys_ioctl+0x9f/0x1a0 fs/ioctl.c:739 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f1665379eb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f1663dd6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f16655f4fa0 RCX: 00007f1665379eb9 RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000005 RBP: 00007f16653e7c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f16655f5038 R14: 00007f16655f4fa0 R15: 00007ffe04dfcf48 Modules linked in: ---[ end trace b1a0e0c72323178f ]--- RIP: 0010:update_sit_entry+0x3eb/0xf50 fs/f2fs/segment.c:-1 Code: 89 45 a8 49 01 c5 41 f6 d7 41 80 e7 07 44 89 f9 41 bf 01 00 00 00 41 d3 e7 4d 89 ee 49 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 06 84 c0 0f 85 a5 08 00 00 41 0f b6 5d 00 44 89 f8 41 RSP: 0018:ffffc90000f7f330 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8881290c33c8 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881290c33c8 RBP: ffffc90000f7f3b0 R08: ffff88811defbb40 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000002 R12: 0000000000004000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000080 FS: 00007f1663dd66c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc5749b9060 CR3: 0000000115f0d000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 89 45 a8 mov %eax,-0x58(%rbp) 3: 49 01 c5 add %rax,%r13 6: 41 f6 d7 not %r15b 9: 41 80 e7 07 and $0x7,%r15b d: 44 89 f9 mov %r15d,%ecx 10: 41 bf 01 00 00 00 mov $0x1,%r15d 16: 41 d3 e7 shl %cl,%r15d 19: 4d 89 ee mov %r13,%r14 1c: 49 c1 ee 03 shr $0x3,%r14 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 41 0f b6 04 06 movzbl (%r14,%rax,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 a5 08 00 00 jne 0x8dc 37: 41 0f b6 5d 00 movzbl 0x0(%r13),%ebx 3c: 44 89 f8 mov %r15d,%eax 3f: 41 rex.B