#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git bugfix/syzbot
On 5/26/25 20:20, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 176e917e010c Add linux-next specific files for 20250523 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=148c2170580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e7902c752bef748 > dashboard link: https://syzkaller.appspot.com/bug?extid=1fa48dc6faf1ff972d7d > compiler: Debian clang version 20.1.6 > (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=128bead4580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=100288e8580000 > > Downloadable assets: > disk image: > https://storage.googleapis.com/syzbot-assets/5f7692c642fa/disk-176e917e.raw.xz > vmlinux: > https://storage.googleapis.com/syzbot-assets/057a442d42d0/vmlinux-176e917e.xz > kernel image: > https://storage.googleapis.com/syzbot-assets/8f8ebdb4dd96/bzImage-176e917e.xz > mounted in repro: > https://storage.googleapis.com/syzbot-assets/81e56747f56a/mount_2.gz > fsck result: OK (log: > https://syzkaller.appspot.com/x/fsck.log?x=138f59f4580000) > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+1fa48dc6faf1ff972...@syzkaller.appspotmail.com > > loop0: detected capacity change from 0 to 262144 > ================================================================== > BUG: KASAN: slab-out-of-bounds in sanity_check_valid_blocks > fs/f2fs/segment.h:385 [inline] > BUG: KASAN: slab-out-of-bounds in build_sit_entries+0x1b0c/0x1f80 > fs/f2fs/segment.c:5060 > Read of size 4 at addr ffff888024798a20 by task syz-executor138/5840 > > CPU: 0 UID: 0 PID: 5840 Comm: syz-executor138 Not tainted > 6.15.0-rc7-next-20250523-syzkaller #0 PREEMPT(full) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 05/07/2025 > Call Trace: > <TASK> > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 > print_address_description mm/kasan/report.c:408 [inline] > print_report+0xd2/0x2b0 mm/kasan/report.c:521 > kasan_report+0x118/0x150 mm/kasan/report.c:634 > sanity_check_valid_blocks fs/f2fs/segment.h:385 [inline] > build_sit_entries+0x1b0c/0x1f80 fs/f2fs/segment.c:5060 > f2fs_build_segment_manager+0x3112/0x49f0 fs/f2fs/segment.c:5707 > f2fs_fill_super+0x45bc/0x6c80 fs/f2fs/super.c:4754 > mount_bdev+0x211/0x2c0 fs/super.c:1736 > legacy_get_tree+0xfd/0x1a0 fs/fs_context.c:666 > vfs_get_tree+0x92/0x2b0 fs/super.c:1802 > do_new_mount+0x24a/0xa40 fs/namespace.c:3869 > do_mount fs/namespace.c:4206 [inline] > __do_sys_mount fs/namespace.c:4417 [inline] > __se_sys_mount+0x317/0x410 fs/namespace.c:4394 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7ff3b36f7e6a > Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 > 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 > 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffc20c3a528 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 00007ffc20c3a540 RCX: 00007ff3b36f7e6a > RDX: 0000200000020440 RSI: 0000200000020480 RDI: 00007ffc20c3a540 > RBP: 0000200000020480 R08: 00007ffc20c3a580 R09: 0000000000020419 > R10: 0000000000000000 R11: 0000000000000286 R12: 0000200000020440 > R13: 00007ffc20c3a580 R14: 0000000000000003 R15: 0000000000000000 > </TASK> > > Allocated by task 5840: > kasan_save_stack mm/kasan/common.c:47 [inline] > kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 > poison_kmalloc_redzone mm/kasan/common.c:377 [inline] > __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 > kasan_kmalloc include/linux/kasan.h:260 [inline] > __do_kmalloc_node mm/slub.c:4327 [inline] > __kvmalloc_node_noprof+0x30d/0x5f0 mm/slub.c:5014 > f2fs_kvmalloc fs/f2fs/f2fs.h:3527 [inline] > f2fs_kvzalloc fs/f2fs/f2fs.h:3533 [inline] > build_sit_info fs/f2fs/segment.c:4779 [inline] > f2fs_build_segment_manager+0x1485/0x49f0 fs/f2fs/segment.c:5696 > f2fs_fill_super+0x45bc/0x6c80 fs/f2fs/super.c:4754 > mount_bdev+0x211/0x2c0 fs/super.c:1736 > legacy_get_tree+0xfd/0x1a0 fs/fs_context.c:666 > vfs_get_tree+0x92/0x2b0 fs/super.c:1802 > do_new_mount+0x24a/0xa40 fs/namespace.c:3869 > do_mount fs/namespace.c:4206 [inline] > __do_sys_mount fs/namespace.c:4417 [inline] > __se_sys_mount+0x317/0x410 fs/namespace.c:4394 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > The buggy address belongs to the object at ffff888024798000 > which belongs to the cache kmalloc-4k of size 4096 > The buggy address is located 0 bytes to the right of > allocated 2592-byte region [ffff888024798000, ffff888024798a20) > > The buggy address belongs to the physical page: > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24798 > head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 > flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) > page_type: f5(slab) > raw: 00fff00000000040 ffff88801a442140 dead000000000122 0000000000000000 > raw: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 > head: 00fff00000000040 ffff88801a442140 dead000000000122 0000000000000000 > head: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 > head: 00fff00000000003 ffffea000091e601 00000000ffffffff 00000000ffffffff > head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 > 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 5840, tgid 5840 (syz-executor138), ts 92190833917, free_ts 90155481941 > set_page_owner include/linux/page_owner.h:32 [inline] > post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 > prep_new_page mm/page_alloc.c:1712 [inline] > get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669 > __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 > alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 > alloc_slab_page mm/slub.c:2450 [inline] > allocate_slab+0x8a/0x3b0 mm/slub.c:2618 > new_slab mm/slub.c:2672 [inline] > ___slab_alloc+0xbfc/0x1480 mm/slub.c:3858 > __slab_alloc mm/slub.c:3948 [inline] > __slab_alloc_node mm/slub.c:4023 [inline] > slab_alloc_node mm/slub.c:4184 [inline] > __do_kmalloc_node mm/slub.c:4326 [inline] > __kvmalloc_node_noprof+0x429/0x5f0 mm/slub.c:5014 > f2fs_kvmalloc fs/f2fs/f2fs.h:3527 [inline] > f2fs_kvzalloc fs/f2fs/f2fs.h:3533 [inline] > build_sit_info fs/f2fs/segment.c:4779 [inline] > f2fs_build_segment_manager+0x1485/0x49f0 fs/f2fs/segment.c:5696 > f2fs_fill_super+0x45bc/0x6c80 fs/f2fs/super.c:4754 > mount_bdev+0x211/0x2c0 fs/super.c:1736 > legacy_get_tree+0xfd/0x1a0 fs/fs_context.c:666 > vfs_get_tree+0x92/0x2b0 fs/super.c:1802 > do_new_mount+0x24a/0xa40 fs/namespace.c:3869 > do_mount fs/namespace.c:4206 [inline] > __do_sys_mount fs/namespace.c:4417 [inline] > __se_sys_mount+0x317/0x410 fs/namespace.c:4394 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > page last free pid 5833 tgid 5833 stack trace: > reset_page_owner include/linux/page_owner.h:25 [inline] > free_pages_prepare mm/page_alloc.c:1248 [inline] > __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706 > discard_slab mm/slub.c:2716 [inline] > __put_partials+0x161/0x1c0 mm/slub.c:3185 > put_cpu_partial+0x17c/0x250 mm/slub.c:3260 > __slab_free+0x2f7/0x400 mm/slub.c:4512 > qlink_free mm/kasan/quarantine.c:163 [inline] > qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 > kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 > __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 > kasan_slab_alloc include/linux/kasan.h:250 [inline] > slab_post_alloc_hook mm/slub.c:4147 [inline] > slab_alloc_node mm/slub.c:4196 [inline] > kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4248 > __alloc_skb+0x112/0x2d0 net/core/skbuff.c:660 > alloc_skb_fclone include/linux/skbuff.h:1386 [inline] > tcp_stream_alloc_skb+0x3d/0x340 net/ipv4/tcp.c:894 > tcp_sendmsg_locked+0x115c/0x5550 net/ipv4/tcp.c:1204 > tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1400 > sock_sendmsg_nosec net/socket.c:712 [inline] > __sock_sendmsg+0x19c/0x270 net/socket.c:727 > sock_write_iter+0x258/0x330 net/socket.c:1131 > new_sync_write fs/read_write.c:593 [inline] > vfs_write+0x548/0xa90 fs/read_write.c:686 > ksys_write+0x145/0x250 fs/read_write.c:738 > > Memory state around the buggy address: > ffff888024798900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff888024798980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >> ffff888024798a00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc > ^ > ffff888024798a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff888024798b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ================================================================== > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkal...@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
