Remounting filesystem read-only ================================================================== BUG: KASAN: use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] BUG: KASAN: use-after-free in do_raw_spin_lock+0x28b/0x360 kernel/locking/spinlock_debug.c:114 Read of size 4 at addr ffff888028a561a4 by task syz-executor.3/5078 CPU: 0 PID: 5078 Comm: syz-executor.3 Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x1f0 mm/kasan/report.c:395 kasan_report+0xcd/0x100 mm/kasan/report.c:495 debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] do_raw_spin_lock+0x28b/0x360 kernel/locking/spinlock_debug.c:114 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0xbf/0x100 kernel/locking/spinlock.c:162 finish_wait+0xba/0x1d0 kernel/sched/wait.c:406 nilfs_segctor_sync+0x457/0x5c0 fs/nilfs2/segment.c:2197 nilfs_construct_segment fs/nilfs2/segment.c:2251 [inline] nilfs_transaction_commit+0x593/0x760 fs/nilfs2/segment.c:285 nilfs_rmdir+0x1e1/0x230 fs/nilfs2/namei.c:336 vfs_rmdir+0x358/0x4b0 fs/namei.c:4120 do_rmdir+0x39d/0x610 fs/namei.c:4181 __do_sys_rmdir fs/namei.c:4200 [inline] __se_sys_rmdir fs/namei.c:4198 [inline] __x64_sys_rmdir+0x45/0x50 fs/namei.c:4198 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa14788b5a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa148552168 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 00007fa1479abf80 RCX: 00007fa14788b5a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 00007fa1478e67b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe2a30313f R14: 00007fa148552300 R15: 0000000000022000 Allocated by task 5078: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:576 [inline] kzalloc include/linux/slab.h:712 [inline] nilfs_segctor_new fs/nilfs2/segment.c:2657 [inline] nilfs_attach_log_writer+0x133/0x8d0 fs/nilfs2/segment.c:2786 nilfs_fill_super+0x38b/0x5d0 fs/nilfs2/super.c:1073 nilfs_mount+0x613/0x9b0 fs/nilfs2/super.c:1317 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x289/0xad0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5097: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:511 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x71/0x110 mm/slub.c:3674 nilfs_segctor_destroy fs/nilfs2/segment.c:2756 [inline] nilfs_detach_log_writer+0x8f3/0xbd0 fs/nilfs2/segment.c:2813 nilfs_attach_log_writer+0xe8/0x8d0 fs/nilfs2/segment.c:2783 nilfs_remount+0x382/0x410 fs/nilfs2/super.c:1171 reconfigure_super+0x3bc/0x7b0 fs/super.c:934 do_remount fs/namespace.c:2702 [inline] path_mount+0xd20/0x10c0 fs/namespace.c:3362 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888028a56000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 420 bytes inside of 1024-byte region [ffff888028a56000, ffff888028a56400) The buggy address belongs to the physical page: page:ffffea0000a29400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28a50 head:ffffea0000a29400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888012041dc0 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3600, tgid 3595 (syz-fuzzer), ts 84916950672, free_ts 84914907715 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4287 __alloc_pages+0x259/0x560 mm/page_alloc.c:5554 alloc_slab_page+0x70/0xf0 mm/slub.c:1794 allocate_slab+0x5e/0x4b0 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0x782/0xe20 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x252/0x310 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x9c/0x1a0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0x112/0x2b0 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1267 [inline] __tcp_send_ack+0x98/0x5f0 net/ipv4/tcp_output.c:3960 tcp_cleanup_rbuf net/ipv4/tcp.c:1628 [inline] tcp_recvmsg_locked+0x1cf3/0x25c0 net/ipv4/tcp.c:2649 tcp_recvmsg+0x337/0x870 net/ipv4/tcp.c:2679 inet_recvmsg+0x13a/0x250 net/ipv4/af_inet.c:859 sock_recvmsg_nosec net/socket.c:995 [inline] sock_recvmsg net/socket.c:1013 [inline] sock_read_iter+0x3fa/0x530 net/socket.c:1086 call_read_iter include/linux/fs.h:2185 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7ac/0xbf0 fs/read_write.c:470 ksys_read+0x177/0x2a0 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1458 [inline] free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3482 skb_free_frag include/linux/skbuff.h:3190 [inline] skb_free_head net/core/skbuff.c:758 [inline] skb_release_data+0x58e/0x6d0 net/core/skbuff.c:789 skb_release_all net/core/skbuff.c:854 [inline] __kfree_skb+0x56/0x1d0 net/core/skbuff.c:868 tcp_eat_recv_skb net/ipv4/tcp.c:1638 [inline] tcp_recvmsg_locked+0x14ab/0x25c0 net/ipv4/tcp.c:2633 tcp_recvmsg+0x337/0x870 net/ipv4/tcp.c:2679 inet_recvmsg+0x13a/0x250 net/ipv4/af_inet.c:859 sock_recvmsg_nosec net/socket.c:995 [inline] sock_recvmsg net/socket.c:1013 [inline] sock_read_iter+0x3fa/0x530 net/socket.c:1086 call_read_iter include/linux/fs.h:2185 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7ac/0xbf0 fs/read_write.c:470 ksys_read+0x177/0x2a0 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888028a56080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888028a56100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888028a56180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888028a56200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888028a56280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================