loop0: detected capacity change from 0 to 32768 bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=errors=continue,metadata_checksum=none,data_checksum=none,checksum_err_retry_nr=12,compression=lz4,foreground_target=invalid label 767,background_target=invalid device 7,degraded=yes,nojournal_transaction_names allowing incompatible features above 0.0: (unknown version) features: lz4,new_siphash,inline_data,new_extent_overwrite,btree_ptr_v2,new_varint,journal_no_flush,alloc_v2,extents_across_btree_nodes bcachefs (loop0): Using encoding defined by superblock: utf8-12.1.0 bcachefs (loop0): initializing new filesystem bcachefs (loop0): going read-write bcachefs (loop0): marking superblocks bcachefs (loop0): initializing freespace bcachefs (loop0): done initializing freespace bcachefs (loop0): reading snapshots table bcachefs (loop0): reading snapshots done bcachefs (loop0): done starting filesystem ================================================================== BUG: KASAN: slab-out-of-bounds in bch2_dirent_init_name+0x396/0x8b0 fs/bcachefs/dirent.c:276 Write of size 1985 at addr ffff8880356f222d by task syz.0.0/5341 CPU: 0 UID: 0 PID: 5341 Comm: syz.0.0 Not tainted 6.16.0-syzkaller-10499-g89748acdf226 #0 PREEMPT(full) 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_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189 __asan_memset+0x22/0x50 mm/kasan/shadow.c:84 bch2_dirent_init_name+0x396/0x8b0 fs/bcachefs/dirent.c:276 bch2_dirent_create_key+0x2a1/0x5f0 fs/bcachefs/dirent.c:319 bch2_dirent_create+0xc5/0xc80 fs/bcachefs/dirent.c:362 bch2_link_trans+0x39e/0x560 fs/bcachefs/namei.c:241 __bch2_link+0x231/0x3f0 fs/bcachefs/fs.c:776 bch2_symlink+0x183/0x240 fs/bcachefs/fs.c:892 vfs_symlink+0x143/0x2f0 fs/namei.c:4730 do_symlinkat+0x1b1/0x3f0 fs/namei.c:4756 __do_sys_symlink fs/namei.c:4777 [inline] __se_sys_symlink fs/namei.c:4775 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4775 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: 0033:0x7f6838b8eb69 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f68399c3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 00007f6838db5fa0 RCX: 00007f6838b8eb69 RDX: 0000000000000000 RSI: 0000200000000cc0 RDI: 0000200000000dc0 RBP: 00007f6838c11df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6838db5fa0 R15: 00007ffc98e76a28 Allocated by task 5341: 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:4365 [inline] __kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4377 kmalloc_noprof include/linux/slab.h:909 [inline] __bch2_trans_kmalloc+0x396/0x9d0 fs/bcachefs/btree_iter.c:3242 bch2_trans_kmalloc_ip fs/bcachefs/btree_iter.h:604 [inline] bch2_trans_kmalloc fs/bcachefs/btree_iter.h:616 [inline] bch2_dirent_create_key+0x113/0x5f0 fs/bcachefs/dirent.c:302 bch2_dirent_create+0xc5/0xc80 fs/bcachefs/dirent.c:362 bch2_link_trans+0x39e/0x560 fs/bcachefs/namei.c:241 __bch2_link+0x231/0x3f0 fs/bcachefs/fs.c:776 bch2_symlink+0x183/0x240 fs/bcachefs/fs.c:892 vfs_symlink+0x143/0x2f0 fs/namei.c:4730 do_symlinkat+0x1b1/0x3f0 fs/namei.c:4756 __do_sys_symlink fs/namei.c:4777 [inline] __se_sys_symlink fs/namei.c:4775 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4775 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 ffff8880356f2000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 557 bytes inside of allocated 2048-byte region [ffff8880356f2000, ffff8880356f2800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x356f0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801a442000 ffffea00010e7c00 0000000000000002 raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 04fff00000000040 ffff88801a442000 ffffea00010e7c00 0000000000000002 head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 04fff00000000003 ffffea0000d5bc01 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5317, tgid 5317 (syz-executor), ts 82528216684, free_ts 51583199972 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab+0x8a/0x370 mm/slub.c:2655 new_slab mm/slub.c:2709 [inline] ___slab_alloc+0xbeb/0x1410 mm/slub.c:3891 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_node_track_caller_noprof+0x2f8/0x4e0 mm/slub.c:4384 kmalloc_reserve+0x136/0x290 net/core/skbuff.c:600 pskb_expand_head+0x18e/0x1150 net/core/skbuff.c:2240 netlink_trim+0x1d5/0x2e0 net/netlink/af_netlink.c:1301 netlink_broadcast_filtered+0xd6/0x12c0 net/netlink/af_netlink.c:1514 nlmsg_multicast_filtered include/net/netlink.h:1165 [inline] nlmsg_multicast include/net/netlink.h:1184 [inline] nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2595 __dev_notify_flags+0xf4/0x2e0 net/core/dev.c:9575 rtnl_configure_link net/core/rtnetlink.c:3591 [inline] rtnl_newlink_create+0x61c/0xb00 net/core/rtnetlink.c:3835 __rtnl_newlink net/core/rtnetlink.c:3942 [inline] rtnl_newlink+0x16d6/0x1c70 net/core/rtnetlink.c:4057 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6946 page last free pid 5119 tgid 5119 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895 __slab_free+0x303/0x3c0 mm/slub.c:4591 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:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4236 getname_flags+0xb8/0x540 fs/namei.c:146 getname include/linux/fs.h:2918 [inline] getname_maybe_null include/linux/fs.h:2925 [inline] vfs_fstatat+0x43/0x170 fs/stat.c:370 __do_sys_newfstatat fs/stat.c:542 [inline] __se_sys_newfstatat fs/stat.c:536 [inline] __x64_sys_newfstatat+0x116/0x190 fs/stat.c:536 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 Memory state around the buggy address: ffff8880356f2700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880356f2780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880356f2800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880356f2880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880356f2900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================