RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000005 RBP: 00007f6874324bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6874532128 R14: 00007f6874532090 R15: 00007ffdcf25cd38 ---[ end trace 8b70419f1496f734 ]--- ================================================================== 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 ffff88811e7d0bc0 by task syz.2.539/2306 CPU: 1 PID: 2306 Comm: syz.2.539 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: 0033:0x7f68742b6cb9 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:00007f6872cf2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6874532090 RCX: 00007f68742b6cb9 RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000005 RBP: 00007f6874324bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6874532128 R14: 00007f6874532090 R15: 00007ffdcf25cd38 Allocated by task 2272: 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 The buggy address belongs to the object at ffff88811e7d0800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 960 bytes inside of 1024-byte region [ffff88811e7d0800, ffff88811e7d0c00) The buggy address belongs to the page: page:ffffea000479f400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e7d0 head:ffffea000479f400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea000461d400 0000000600000006 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 267, ts 18895583243, free_ts 18895506203 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_fclone include/linux/skbuff.h:1176 [inline] sk_stream_alloc_skb+0x21a/0xb70 net/ipv4/tcp.c:884 tcp_sendmsg_locked+0xc6d/0x37d0 net/ipv4/tcp.c:1292 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1444 inet_sendmsg+0xa5/0xc0 net/ipv4/af_inet.c:830 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] sock_write_iter+0x2a6/0x3a0 net/socket.c:1018 call_write_iter include/linux/fs.h:2066 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x758/0xdc0 fs/read_write.c:605 ksys_write+0x149/0x250 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:667 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 destroy_compound_page include/linux/mm.h:970 [inline] __put_compound_page+0x77/0xb0 mm/swap.c:117 __put_page+0xbd/0xe0 mm/swap.c:133 put_page include/linux/mm.h:1268 [inline] __skb_frag_unref include/linux/skbuff.h:3124 [inline] skb_release_data+0x21f/0x670 net/core/skbuff.c:620 skb_release_all net/core/skbuff.c:680 [inline] __kfree_skb+0x50/0x70 net/core/skbuff.c:694 sk_wmem_free_skb include/net/sock.h:1623 [inline] tcp_rtx_queue_unlink_and_free+0x205/0x740 include/net/tcp.h:1890 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3367 [inline] tcp_ack+0x214c/0x5e90 net/ipv4/tcp_input.c:3924 tcp_rcv_established+0xd62/0x19f0 net/ipv4/tcp_input.c:5921 tcp_v4_do_rcv+0x4c1/0x7c0 net/ipv4/tcp_ipv4.c:1698 sk_backlog_rcv include/net/sock.h:1071 [inline] __release_sock+0x146/0x360 net/core/sock.c:2589 __sk_flush_backlog+0x26/0x40 net/core/sock.c:2612 sk_flush_backlog include/net/sock.h:1166 [inline] tcp_sendmsg_locked+0x2962/0x37d0 net/ipv4/tcp.c:1288 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1444 inet_sendmsg+0xa5/0xc0 net/ipv4/af_inet.c:830 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] sock_write_iter+0x2a6/0x3a0 net/socket.c:1018 Memory state around the buggy address: ffff88811e7d0a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811e7d0b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811e7d0b80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff88811e7d0c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88811e7d0c80: 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: 2306 Comm: syz.2.539 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:ffffc90000dc7330 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88811e7d0bc8 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811e7d0bc8 RBP: ffffc90000dc73b0 R08: ffff8881158262c0 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000002 R12: 0000000000004000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000080 FS: 00007f6872cf26c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f26f8a22f88 CR3: 00000001164de000 CR4: 00000000003526a0 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: 0033:0x7f68742b6cb9 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:00007f6872cf2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6874532090 RCX: 00007f68742b6cb9 RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000005 RBP: 00007f6874324bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6874532128 R14: 00007f6874532090 R15: 00007ffdcf25cd38 Modules linked in: ---[ end trace 8b70419f1496f735 ]--- 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:ffffc90000dc7330 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88811e7d0bc8 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88811e7d0bc8 RBP: ffffc90000dc73b0 R08: ffff8881158262c0 R09: 0000000000000003 R10: 00000000ffffffff R11: 0000000000000002 R12: 0000000000004000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000080 FS: 00007f6872cf26c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555556ed908 CR3: 00000001164de000 CR4: 00000000003526a0 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