RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007eff755f1eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007eff757e4038 R14: 00007eff757e3fa0 R15: 00007ffff492b9d8 ---[ end trace ef8f3c48013c6702 ]--- ================================================================== 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+0x508/0x590 fs/f2fs/segment.c:2663 Read of size 4 at addr ffff888126ec33c0 by task syz.5.1103/4496 CPU: 1 PID: 4496 Comm: syz.5.1103 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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+0x100/0x140 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+0x508/0x590 fs/f2fs/segment.c:2663 new_curseg+0x12ea/0x18d0 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+0x5e7/0x990 fs/f2fs/file.c:1761 f2fs_fallocate+0x3dd/0x750 fs/f2fs/file.c:1866 vfs_fallocate+0x4b9/0x590 fs/open.c:310 ksys_fallocate fs/open.c:333 [inline] __do_sys_fallocate fs/open.c:341 [inline] __se_sys_fallocate fs/open.c:339 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:339 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7eff7555be99 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:00007eff73fb5028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007eff757e3fa0 RCX: 00007eff7555be99 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007eff755f1eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007eff757e4038 R14: 00007eff757e3fa0 R15: 00007ffff492b9d8 Allocated by task 4496: 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+0xd4/0x100 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x19f/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:3372 [inline] f2fs_kvzalloc fs/f2fs/f2fs.h:3378 [inline] build_sit_info fs/f2fs/segment.c:4395 [inline] f2fs_build_segment_manager+0xdb6/0x48c0 fs/f2fs/segment.c:5258 f2fs_fill_super+0x4a08/0x73d0 fs/f2fs/super.c:4317 mount_bdev+0x26a/0x380 fs/super.c:1442 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4598 legacy_get_tree+0xed/0x190 fs/fs_context.c:593 vfs_get_tree+0x89/0x260 fs/super.c:1572 do_new_mount+0x25a/0xa30 fs/namespace.c:3006 path_mount+0x581/0xca0 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 kvfree_call_rcu+0x117/0x670 kernel/rcu/tree.c:3539 drop_sysctl_table+0x2f5/0x430 fs/proc/proc_sysctl.c:1684 unregister_sysctl_table+0x75/0x120 fs/proc/proc_sysctl.c:1722 unregister_net_sysctl_table+0x15/0x20 net/sysctl_net.c:127 neigh_sysctl_unregister+0x78/0x90 net/core/neighbour.c:3732 devinet_sysctl_unregister net/ipv4/devinet.c:2650 [inline] inetdev_destroy net/ipv4/devinet.c:326 [inline] inetdev_event+0x7df/0x1010 net/ipv4/devinet.c:1612 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:2052 [inline] call_netdevice_notifiers_extack net/core/dev.c:2064 [inline] call_netdevice_notifiers net/core/dev.c:2078 [inline] unregister_netdevice_many+0x100e/0x19f0 net/core/dev.c:10778 default_device_exit_batch+0x35e/0x3c0 net/core/dev.c:11298 ops_exit_list net/core/net_namespace.c:190 [inline] cleanup_net+0x5fe/0xb80 net/core/net_namespace.c:609 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447 kthread+0x324/0x3b0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff888126ec3000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 960 bytes inside of 1024-byte region [ffff888126ec3000, ffff888126ec3400) The buggy address belongs to the page: page:ffffea00049bb000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x126ec0 head:ffffea00049bb000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 281, ts 23477760755, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x176/0x190 mm/page_alloc.c:2462 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384 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+0x2f8/0x4c0 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+0x1e4/0x310 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+0x52b/0x700 lib/kobject_uevent.c:608 kobject_uevent+0x1d/0x30 lib/kobject_uevent.c:657 rx_queue_add_kobject net/core/net-sysfs.c:1029 [inline] net_rx_queue_update_kobjects+0x1e9/0x410 net/core/net-sysfs.c:1069 register_queue_kobjects net/core/net-sysfs.c:1750 [inline] netdev_register_kobject+0x23d/0x330 net/core/net-sysfs.c:2001 register_netdevice+0xdae/0x13a0 net/core/dev.c:10067 veth_newlink+0x696/0xb60 drivers/net/veth.c:1360 page_owner free stack trace missing Memory state around the buggy address: ffff888126ec3280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888126ec3300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888126ec3380: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888126ec3400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888126ec3480: 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: 0 PID: 4496 Comm: syz.5.1103 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:update_sit_entry+0x3d6/0xfd0 fs/f2fs/segment.c:-1 Code: 89 45 a8 49 01 c7 41 f6 d6 41 80 e6 07 41 bd 01 00 00 00 44 89 f1 41 d3 e5 4d 89 fc 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 0f 85 3a 09 00 00 41 0f b6 1f 45 89 ee 41 21 RSP: 0018:ffffc9000208f678 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff888126ec33c8 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888126ec33c8 RBP: ffffc9000208f6f0 R08: ffff888118df8006 R09: 1ffff110231bf000 R10: dffffc0000000000 R11: ffffed10231bf001 R12: 0000000000000000 R13: 0000000000000080 R14: 0000000000000007 R15: 0000000000000000 FS: 00007eff73fb56c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007eff755a9580 CR3: 000000012705e000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: f2fs_allocate_data_block+0x10c9/0x3880 fs/f2fs/segment.c:3481 __allocate_data_block+0x52b/0xa00 fs/f2fs/data.c:1413 f2fs_map_blocks+0xd94/0x34e0 fs/f2fs/data.c:1581 expand_inode_data+0x616/0x990 fs/f2fs/file.c:1765 f2fs_fallocate+0x3dd/0x750 fs/f2fs/file.c:1866 vfs_fallocate+0x4b9/0x590 fs/open.c:310 ksys_fallocate fs/open.c:333 [inline] __do_sys_fallocate fs/open.c:341 [inline] __se_sys_fallocate fs/open.c:339 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:339 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7eff7555be99 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:00007eff73fb5028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007eff757e3fa0 RCX: 00007eff7555be99 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007eff755f1eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000008800000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007eff757e4038 R14: 00007eff757e3fa0 R15: 00007ffff492b9d8 Modules linked in: ---[ end trace ef8f3c48013c6703 ]--- RIP: 0010:update_sit_entry+0x3d6/0xfd0 fs/f2fs/segment.c:-1 Code: 89 45 a8 49 01 c7 41 f6 d6 41 80 e6 07 41 bd 01 00 00 00 44 89 f1 41 d3 e5 4d 89 fc 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 0f 85 3a 09 00 00 41 0f b6 1f 45 89 ee 41 21 RSP: 0018:ffffc9000208f678 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff888126ec33c8 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888126ec33c8 RBP: ffffc9000208f6f0 R08: ffff888118df8006 R09: 1ffff110231bf000 R10: dffffc0000000000 R11: ffffed10231bf001 R12: 0000000000000000 R13: 0000000000000080 R14: 0000000000000007 R15: 0000000000000000 FS: 00007eff73fb56c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007eff73f73d58 CR3: 000000012705e000 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 c7 add %rax,%r15 6: 41 f6 d6 not %r14b 9: 41 80 e6 07 and $0x7,%r14b d: 41 bd 01 00 00 00 mov $0x1,%r13d 13: 44 89 f1 mov %r14d,%ecx 16: 41 d3 e5 shl %cl,%r13d 19: 4d 89 fc mov %r15,%r12 1c: 49 c1 ec 03 shr $0x3,%r12 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 41 0f b6 04 04 movzbl (%r12,%rax,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 3a 09 00 00 jne 0x971 37: 41 0f b6 1f movzbl (%r15),%ebx 3b: 45 89 ee mov %r13d,%r14d 3e: 41 rex.B 3f: 21 .byte 0x21