bcachefs (loop0): recovering from clean shutdown, journal seq 10 bcachefs (loop0): Doing compatible version upgrade from 1.7: mi_btree_bitmap to 1.9: disk_accounting_v2 running recovery passes: check_allocations ================================================================== BUG: KASAN: slab-use-after-free in bch2_fs_recovery+0xe85/0x38c0 fs/bcachefs/recovery.c:699 Read of size 8 at addr ffff88807f038f98 by task syz-executor.0/11883 CPU: 0 PID: 11883 Comm: syz-executor.0 Tainted: G W 6.10.0-rc2-next-20240606-syzkaller #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:91 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:117 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 bch2_fs_recovery+0xe85/0x38c0 fs/bcachefs/recovery.c:699 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1029 bch2_fs_get_tree+0xce4/0x1620 fs/bcachefs/fs.c:1922 vfs_get_tree+0x90/0x2a0 fs/super.c:1780 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe7ea87e66a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe7eb59aef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fe7eb59af80 RCX: 00007fe7ea87e66a RDX: 0000000020011a00 RSI: 0000000020011a40 RDI: 00007fe7eb59af40 RBP: 0000000020011a00 R08: 00007fe7eb59af80 R09: 0000000001008054 R10: 0000000001008054 R11: 0000000000000202 R12: 0000000020011a40 R13: 00007fe7eb59af40 R14: 00000000000119f5 R15: 0000000020000100 Allocated by task 11883: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4122 [inline] kmalloc_node_track_caller_noprof+0x225/0x440 mm/slub.c:4142 __do_krealloc mm/slab_common.c:1183 [inline] krealloc_noprof+0x7d/0x120 mm/slab_common.c:1216 bch2_sb_realloc+0x2f5/0x660 fs/bcachefs/super-io.c:189 __copy_super+0x5dc/0xe70 fs/bcachefs/super-io.c:579 bch2_sb_to_fs+0xab/0x150 fs/bcachefs/super-io.c:606 bch2_fs_alloc+0xd36/0x2040 fs/bcachefs/super.c:823 bch2_fs_open+0x8cc/0xdf0 fs/bcachefs/super.c:2104 bch2_fs_get_tree+0x750/0x1620 fs/bcachefs/fs.c:1909 vfs_get_tree+0x90/0x2a0 fs/super.c:1780 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 11883: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4437 [inline] kfree+0x149/0x360 mm/slub.c:4558 krealloc_noprof+0xcf/0x120 bch2_sb_realloc+0x2f5/0x660 fs/bcachefs/super-io.c:189 bch2_sb_field_resize_id+0x140/0x7c0 fs/bcachefs/super-io.c:221 bch2_sb_counters_from_cpu+0xac/0x300 fs/bcachefs/sb-counters.c:67 bch2_write_super+0xe80/0x3c80 fs/bcachefs/super-io.c:966 bch2_fs_recovery+0xe6c/0x38c0 fs/bcachefs/recovery.c:697 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1029 bch2_fs_get_tree+0xce4/0x1620 fs/bcachefs/fs.c:1922 vfs_get_tree+0x90/0x2a0 fs/super.c:1780 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807f038000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3992 bytes inside of freed 4096-byte region [ffff88807f038000, ffff88807f039000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7f038 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: 0xfdffffff(slab) raw: 00fff00000000040 ffff888015042140 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000040004 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff888015042140 dead000000000100 dead000000000122 head: 0000000000000000 0000000000040004 00000001fdffffff 0000000000000000 head: 00fff00000000003 ffffea0001fc0e01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 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 0x1d2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5163, tgid 5163 (kworker/1:5), ts 302972278904, free_ts 302906664519 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1470 prep_new_page mm/page_alloc.c:1478 [inline] get_page_from_freelist+0x2cbd/0x2d70 mm/page_alloc.c:3457 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4715 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2265 allocate_slab+0x5a/0x2f0 mm/slub.c:2428 new_slab mm/slub.c:2481 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3667 __slab_alloc+0x58/0xa0 mm/slub.c:3757 __slab_alloc_node mm/slub.c:3810 [inline] slab_alloc_node mm/slub.c:3989 [inline] __do_kmalloc_node mm/slub.c:4121 [inline] kmalloc_node_track_caller_noprof+0x281/0x440 mm/slub.c:4142 kmalloc_reserve+0x111/0x2a0 net/core/skbuff.c:597 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:666 alloc_skb include/linux/skbuff.h:1314 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline] nsim_dev_trap_report_work+0x254/0xaa0 drivers/net/netdevsim/dev.c:850 process_one_work kernel/workqueue.c:3248 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 page last free pid 5112 tgid 5112 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1089 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2621 discard_slab mm/slub.c:2527 [inline] __put_partials+0xeb/0x130 mm/slub.c:2995 put_cpu_partial+0x17c/0x250 mm/slub.c:3070 __slab_free+0x2ea/0x3d0 mm/slub.c:4307 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3941 [inline] slab_alloc_node mm/slub.c:4001 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4008 getname_flags+0xb7/0x540 fs/namei.c:139 getname fs/namei.c:225 [inline] __do_sys_unlink fs/namei.c:4466 [inline] __se_sys_unlink fs/namei.c:4464 [inline] __x64_sys_unlink+0x3a/0x50 fs/namei.c:4464 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88807f038e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807f038f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807f038f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807f039000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807f039080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================