loop0: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-out-of-bounds in bch2_sb_downgrade_to_text+0x58d/0x680 fs/bcachefs/sb-downgrade.c:185 Read of size 2 at addr ffff88805af86000 by task syz-executor.0/12748 CPU: 0 PID: 12748 Comm: syz-executor.0 Not tainted 6.9.0-rc7-syzkaller-00183-gcf87f46fd34d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 bch2_sb_downgrade_to_text+0x58d/0x680 fs/bcachefs/sb-downgrade.c:185 __bch2_sb_field_to_text+0x123/0x1e0 fs/bcachefs/super-io.c:1245 bch2_sb_field_validate+0x248/0x2d0 fs/bcachefs/super-io.c:1228 bch2_sb_validate.isra.0+0x6d8/0xce0 fs/bcachefs/super-io.c:468 __bch2_read_super+0x93c/0x12a0 fs/bcachefs/super-io.c:822 bch2_fs_open+0x3e5/0x1110 fs/bcachefs/super.c:2052 bch2_mount+0xdcc/0x1130 fs/bcachefs/fs.c:1903 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1779 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4bad47f46a 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:00007f4bae159ef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f4bae159f80 RCX: 00007f4bad47f46a RDX: 0000000020011a00 RSI: 0000000020011a40 RDI: 00007f4bae159f40 RBP: 0000000020011a00 R08: 00007f4bae159f80 R09: 0000000000000010 R10: 0000000000000010 R11: 0000000000000202 R12: 0000000020011a40 R13: 00007f4bae159f40 R14: 00000000000119f6 R15: 0000000020000080 Allocated by task 12748: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3972 [inline] __kmalloc_node_track_caller+0x220/0x480 mm/slub.c:3992 __do_krealloc mm/slab_common.c:1192 [inline] krealloc+0x5d/0x100 mm/slab_common.c:1225 bch2_sb_realloc+0x242/0x5d0 fs/bcachefs/super-io.c:189 read_one_super+0x2ed/0x11e0 fs/bcachefs/super-io.c:659 __bch2_read_super+0x4d6/0x12a0 fs/bcachefs/super-io.c:750 bch2_fs_open+0x3e5/0x1110 fs/bcachefs/super.c:2052 bch2_mount+0xdcc/0x1130 fs/bcachefs/fs.c:1903 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1779 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88805af84000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 0 bytes to the right of allocated 8192-byte region [ffff88805af84000, ffff88805af86000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5af80 head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888015042280 ffffea0001799800 dead000000000002 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 head: 00fff00000000840 ffff888015042280 ffffea0001799800 dead000000000002 head: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 head: 00fff00000000003 ffffea00016be001 dead000000000122 00000000ffffffff head: 0000000800000000 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 9432, tgid 9432 (syz-executor.1), ts 476617529676, free_ts 476568248415 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2180 [inline] allocate_slab mm/slub.c:2343 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2396 ___slab_alloc+0x66d/0x1790 mm/slub.c:3530 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3615 __slab_alloc_node mm/slub.c:3668 [inline] slab_alloc_node mm/slub.c:3841 [inline] __do_kmalloc_node mm/slub.c:3971 [inline] __kmalloc_node+0x379/0x480 mm/slub.c:3979 kmalloc_node include/linux/slab.h:648 [inline] kvmalloc_node+0x6f/0x1a0 mm/util.c:634 kvmalloc include/linux/slab.h:766 [inline] kvmalloc_array include/linux/slab.h:784 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline] ptr_ring_init include/linux/ptr_ring.h:489 [inline] skb_array_init include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x125/0x3b0 net/sched/sch_generic.c:860 qdisc_create_dflt+0x101/0x440 net/sched/sch_generic.c:1007 attach_one_default_qdisc net/sched/sch_generic.c:1165 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2500 [inline] attach_default_qdiscs net/sched/sch_generic.c:1183 [inline] dev_activate+0x667/0x1310 net/sched/sch_generic.c:1242 __dev_open+0x396/0x4e0 net/core/dev.c:1439 __dev_change_flags+0x561/0x720 net/core/dev.c:8692 dev_change_flags+0x8f/0x160 net/core/dev.c:8764 do_setlink+0x1a42/0x3ff0 net/core/rtnetlink.c:2884 __rtnl_newlink+0xc35/0x1960 net/core/rtnetlink.c:3680 page last free pid 9432 tgid 9432 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487 __put_partials+0x14c/0x170 mm/slub.c:2911 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3804 [inline] slab_alloc_node mm/slub.c:3851 [inline] __do_kmalloc_node mm/slub.c:3971 [inline] __kmalloc+0x1bd/0x440 mm/slub.c:3985 kmalloc include/linux/slab.h:632 [inline] kzalloc include/linux/slab.h:749 [inline] fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x337/0x1940 net/ipv6/route.c:3759 ip6_route_add+0x26/0x190 net/ipv6/route.c:3851 addrconf_prefix_route+0x2fe/0x510 net/ipv6/addrconf.c:2484 add_v4_addrs+0x6ce/0x9f0 net/ipv6/addrconf.c:3267 addrconf_gre_config net/ipv6/addrconf.c:3542 [inline] addrconf_init_auto_addrs+0x18a/0x820 net/ipv6/addrconf.c:3560 addrconf_notify+0xe9e/0x19e0 net/ipv6/addrconf.c:3741 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1950 Memory state around the buggy address: ffff88805af85f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805af85f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805af86000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805af86080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805af86100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================