EXT4-fs error (device loop6): __ext4_iget:5057: inode #11: block 1: comm syz.6.3869: invalid block ================================================================== BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:930 [inline] BUG: KASAN: use-after-free in enqueue_timer+0xa6/0x480 kernel/time/timer.c:611 Write of size 8 at addr ffff888113a044c0 by task syz.6.3869/12282 CPU: 0 PID: 12282 Comm: syz.6.3869 Not tainted 6.1.112-syzkaller-00110-g976b055754d7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x158/0x4e0 mm/kasan/report.c:427 kasan_report+0x13c/0x170 mm/kasan/report.c:531 __asan_report_store8_noabort+0x17/0x20 mm/kasan/report_generic.c:356 hlist_add_head include/linux/list.h:930 [inline] enqueue_timer+0xa6/0x480 kernel/time/timer.c:611 internal_add_timer kernel/time/timer.c:640 [inline] __mod_timer+0x8d3/0xcf0 kernel/time/timer.c:1121 mod_timer+0x1f/0x30 kernel/time/timer.c:1172 ext4_update_super+0xa41/0xe50 fs/ext4/super.c:6066 ext4_commit_super+0xe3/0x4b0 fs/ext4/super.c:6085 ext4_handle_error+0x5e1/0x890 fs/ext4/super.c:678 __ext4_error_inode+0x327/0x5e0 fs/ext4/super.c:810 ext4_check_blockref+0x22b/0x270 fs/ext4/block_validity.c:364 __ext4_iget+0x28b2/0x3ee0 fs/ext4/inode.c:5057 ext4_orphan_get+0x1c2/0x5f0 fs/ext4/ialloc.c:1396 ext4_orphan_cleanup+0x901/0x11b0 fs/ext4/orphan.c:467 __ext4_fill_super fs/ext4/super.c:5520 [inline] ext4_fill_super+0x7d46/0x8460 fs/ext4/super.c:5651 get_tree_bdev+0x440/0x680 fs/super.c:1368 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5681 vfs_get_tree+0x88/0x290 fs/super.c:1575 do_new_mount+0x2ba/0xb30 fs/namespace.c:3051 path_mount+0x671/0x1070 fs/namespace.c:3381 do_mount fs/namespace.c:3394 [inline] __do_sys_mount fs/namespace.c:3602 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3579 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3579 x64_sys_call+0x49d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f774c17feba 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:00007f774cfd2e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f774cfd2ef0 RCX: 00007f774c17feba RDX: 0000000020000ac0 RSI: 0000000020000180 RDI: 00007f774cfd2eb0 RBP: 0000000020000ac0 R08: 00007f774cfd2ef0 R09: 0000000003810744 R10: 0000000003810744 R11: 0000000000000246 R12: 0000000020000180 R13: 00007f774cfd2eb0 R14: 0000000000000451 R15: 0000000020000700 Allocated by task 11646: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:388 kasan_kmalloc include/linux/kasan.h:212 [inline] __do_kmalloc_node mm/slab_common.c:938 [inline] __kmalloc_node_track_caller+0xb3/0x1e0 mm/slab_common.c:958 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x125/0x2d0 net/core/skbuff.c:515 alloc_skb include/linux/skbuff.h:1290 [inline] nlmsg_new include/net/netlink.h:991 [inline] rtmsg_ifinfo_build_skb+0x7f/0x180 net/core/rtnetlink.c:3934 rtmsg_ifinfo_event net/core/rtnetlink.c:3970 [inline] rtmsg_ifinfo+0x78/0x120 net/core/rtnetlink.c:3979 netdev_state_change+0x1be/0x250 net/core/dev.c:1369 do_setlink+0x41c/0x4050 net/core/rtnetlink.c:3035 rtnl_group_changelink net/core/rtnetlink.c:3329 [inline] __rtnl_newlink net/core/rtnetlink.c:3586 [inline] rtnl_newlink+0x10cc/0x2030 net/core/rtnetlink.c:3623 rtnetlink_rcv_msg+0x9a5/0xca0 net/core/rtnetlink.c:6121 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2517 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6139 netlink_unicast_kernel net/netlink/af_netlink.c:1327 [inline] netlink_unicast+0x906/0xab0 net/netlink/af_netlink.c:1353 netlink_sendmsg+0xa15/0xd30 net/netlink/af_netlink.c:1875 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2504 ___sys_sendmsg net/socket.c:2558 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2587 __do_sys_sendmsg net/socket.c:2596 [inline] __se_sys_sendmsg net/socket.c:2594 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2594 x64_sys_call+0x16a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 11646: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1745 [inline] slab_free_freelist_hook mm/slub.c:1771 [inline] slab_free mm/slub.c:3684 [inline] __kmem_cache_free+0x218/0x3b0 mm/slub.c:3697 kfree+0x7a/0xf0 mm/slab_common.c:990 skb_free_head net/core/skbuff.c:762 [inline] pskb_expand_head+0x417/0x1380 net/core/skbuff.c:1880 netlink_trim+0x19b/0x230 net/netlink/af_netlink.c:1309 netlink_broadcast+0x6b/0x1160 net/netlink/af_netlink.c:1503 nlmsg_multicast include/net/netlink.h:1071 [inline] nlmsg_notify+0xfb/0x1c0 net/netlink/af_netlink.c:2560 rtnl_notify net/core/rtnetlink.c:767 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3958 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3973 [inline] rtmsg_ifinfo+0xe7/0x120 net/core/rtnetlink.c:3979 netdev_state_change+0x1be/0x250 net/core/dev.c:1369 do_setlink+0x41c/0x4050 net/core/rtnetlink.c:3035 rtnl_group_changelink net/core/rtnetlink.c:3329 [inline] __rtnl_newlink net/core/rtnetlink.c:3586 [inline] rtnl_newlink+0x10cc/0x2030 net/core/rtnetlink.c:3623 rtnetlink_rcv_msg+0x9a5/0xca0 net/core/rtnetlink.c:6121 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2517 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6139 netlink_unicast_kernel net/netlink/af_netlink.c:1327 [inline] netlink_unicast+0x906/0xab0 net/netlink/af_netlink.c:1353 netlink_sendmsg+0xa15/0xd30 net/netlink/af_netlink.c:1875 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2504 ___sys_sendmsg net/socket.c:2558 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2587 __do_sys_sendmsg net/socket.c:2596 [inline] __se_sys_sendmsg net/socket.c:2594 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2594 x64_sys_call+0x16a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb4/0xc0 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496 __call_rcu_common kernel/rcu/tree.c:2807 [inline] call_rcu+0xdc/0x10f0 kernel/rcu/tree.c:2926 exfat_put_super+0xa5/0xb0 fs/exfat/super.c:53 generic_shutdown_super+0x14f/0x370 fs/super.c:503 kill_block_super+0x7e/0xe0 fs/super.c:1472 deactivate_locked_super+0xad/0x110 fs/super.c:334 deactivate_super+0xbe/0xf0 fs/super.c:365 cleanup_mnt+0x485/0x510 fs/namespace.c:1186 __cleanup_mnt+0x19/0x20 fs/namespace.c:1193 task_work_run+0x24d/0x2e0 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x94/0xa0 kernel/entry/common.c:177 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x26/0x130 kernel/entry/common.c:303 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888113a04000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1216 bytes inside of 4096-byte region [ffff888113a04000, ffff888113a05000) The buggy address belongs to the physical page: page:ffffea00044e8000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113a00 head:ffffea00044e8000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0004a83a00 dead000000000002 ffff888100043380 raw: 0000000000000000 0000000000040004 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 117, tgid 117 (udevadm), ts 4815248185, free_ts 0 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597 get_page_from_freelist+0x2980/0x2a10 mm/page_alloc.c:4439 __alloc_pages+0x234/0x610 mm/page_alloc.c:5728 alloc_slab_page+0x6c/0xf0 allocate_slab mm/slub.c:1962 [inline] new_slab+0x90/0x3e0 mm/slub.c:2015 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3203 __slab_alloc+0x5d/0xa0 mm/slub.c:3302 slab_alloc_node mm/slub.c:3387 [inline] __kmem_cache_alloc_node+0x1af/0x250 mm/slub.c:3460 kmalloc_trace+0x2a/0xa0 mm/slab_common.c:1028 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:693 [inline] kernfs_iop_get_link+0x65/0x610 fs/kernfs/symlink.c:135 vfs_readlink+0x166/0x390 fs/namei.c:5124 do_readlinkat+0x27f/0x3a0 fs/stat.c:480 __do_sys_readlink fs/stat.c:501 [inline] __se_sys_readlink fs/stat.c:498 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:498 x64_sys_call+0x297/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:90 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 page_owner free stack trace missing Memory state around the buggy address: ffff888113a04380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113a04400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888113a04480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888113a04500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113a04580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== EXT4-fs error (device loop6): ext4_orphan_get:1401: comm syz.6.3869: couldn't read orphan inode 11 (err -117) EXT4-fs (loop6): mounted filesystem without journal. Quota mode: none.