bcachefs (loop0): running explicit recovery pass scan_for_btree_nodes (1), currently at recovery_pass_empty (0) error reading btree root btree=extents level=0: btree_node_read_error, fixing ================================================================== BUG: KASAN: use-after-free in bch2_btree_node_read_done+0x1118/0x6180 fs/bcachefs/btree_io.c:1083 Read of size 8 at addr ffff88803f8d0c10 by task syz.0.16/5514 CPU: 0 UID: 0 PID: 5514 Comm: syz.0.16 Not tainted 6.14.0-rc5-syzkaller-00025-gcfced12f5100 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 bch2_btree_node_read_done+0x1118/0x6180 fs/bcachefs/btree_io.c:1083 btree_node_read_work+0x6dc/0x1380 fs/bcachefs/btree_io.c:1358 bch2_btree_node_read+0x2433/0x29f0 __bch2_btree_root_read fs/bcachefs/btree_io.c:1789 [inline] bch2_btree_root_read+0x626/0x7b0 fs/bcachefs/btree_io.c:1811 read_btree_roots+0x3d3/0xa70 fs/bcachefs/recovery.c:581 bch2_fs_recovery+0x260f/0x3de0 fs/bcachefs/recovery.c:928 bch2_fs_start+0x37c/0x610 fs/bcachefs/super.c:1041 bch2_fs_get_tree+0xdb7/0x17a0 fs/bcachefs/fs.c:2203 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 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: 0033:0x7fa09db8e90a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffd91d5ff8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fffd91d6080 RCX: 00007fa09db8e90a RDX: 0000400000000100 RSI: 0000400000000080 RDI: 00007fffd91d6040 RBP: 0000400000000100 R08: 00007fffd91d6080 R09: 00000000022100c0 R10: 00000000022100c0 R11: 0000000000000246 R12: 0000400000000080 R13: 00007fffd91d6040 R14: 0000000000005aa0 R15: 00004000000001c0 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88803f8d0000 pfn:0x3f8d0 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f0(buddy) raw: 04fff00000000000 ffffea0000fee188 ffffea0000fe2d08 0000000000000000 raw: ffff88803f8d0000 0000000000000001 00000000f0000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 4727, tgid 4727 (udevd), ts 28432960265, free_ts 89265322305 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2587 new_slab mm/slub.c:2640 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826 __slab_alloc+0x58/0xa0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] kmem_cache_alloc_lru_noprof+0x26c/0x390 mm/slub.c:4183 __d_alloc+0x31/0x740 fs/dcache.c:1664 d_alloc fs/dcache.c:1743 [inline] d_alloc_parallel+0xdf/0x1630 fs/dcache.c:2507 __lookup_slow+0x117/0x400 fs/namei.c:1778 lookup_slow+0x53/0x70 fs/namei.c:1810 walk_component fs/namei.c:2114 [inline] link_path_walk+0x99b/0xea0 fs/namei.c:2479 path_openat+0x266/0x3590 fs/namei.c:3985 do_filp_open+0x27f/0x4e0 fs/namei.c:4016 do_sys_openat2+0x13e/0x1d0 fs/open.c:1428 page last free pid 5331 tgid 5331 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660 __slab_free+0x2c2/0x380 mm/slub.c:4520 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/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:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] __kmalloc_cache_noprof+0x1d9/0x390 mm/slub.c:4320 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] ref_tracker_alloc+0x14b/0x490 lib/ref_tracker.c:203 register_netdevice+0x1522/0x1b60 net/core/dev.c:10965 cfg80211_register_netdevice+0x149/0x2f0 net/wireless/core.c:1482 ieee80211_if_add+0x119d/0x1780 net/mac80211/iface.c:2214 ieee80211_register_hw+0x3708/0x42e0 net/mac80211/main.c:1604 mac80211_hwsim_new_radio+0x2ae8/0x4a40 drivers/net/wireless/virtual/mac80211_hwsim.c:5558 hwsim_new_radio_nl+0xece/0x2290 drivers/net/wireless/virtual/mac80211_hwsim.c:6242 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0xb1f/0xec0 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x206/0x480 net/netlink/af_netlink.c:2533 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 Memory state around the buggy address: ffff88803f8d0b00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88803f8d0b80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88803f8d0c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88803f8d0c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88803f8d0d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 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