==================================================================
BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:901 [inline]
BUG: KASAN: slab-use-after-free in detach_timer+0x14d/0x2f0 kernel/time/timer.c:880
Write of size 8 at addr ffff888085919500 by task udevd/7905

CPU: 1 PID: 7905 Comm: udevd Not tainted 6.3.0-syzkaller-13091-g3c4aa4434377 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:351 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:462
 kasan_report+0x176/0x1b0 mm/kasan/report.c:572
 __hlist_del include/linux/list.h:901 [inline]
 detach_timer+0x14d/0x2f0 kernel/time/timer.c:880
 expire_timers kernel/time/timer.c:1734 [inline]
 __run_timers+0x5d4/0x860 kernel/time/timer.c:2022
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
 __do_softirq+0x2ab/0x908 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x159/0x240 kernel/softirq.c:650
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:check_kcov_mode kernel/kcov.c:184 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:236 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x34/0x90 kernel/kcov.c:290
Code: 8b 15 10 25 78 7e 65 8b 05 11 25 78 7e a9 00 01 ff 00 74 10 a9 00 01 00 00 74 5b 83 ba 0c 16 00 00 00 74 52 8b 82 e8 15 00 00 <83> f8 03 75 47 48 8b 8a f0 15 00 00 44 8b 8a ec 15 00 00 49 c1 e1
RSP: 0018:ffffc900037bf950 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880b7d68000 RCX: dffffc0000000000
RDX: ffff88802d373b80 RSI: 000000000000002e RDI: 0000000000000040
RBP: ffff888037d68fe6 R08: ffffffff813dd2fa R09: fffffbfff1cab85e
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000fff
R13: ffff888037d68000 R14: 0000000037d68000 R15: 000000000000002e
 phys_addr_valid arch/x86/mm/physaddr.h:7 [inline]
 __phys_addr+0x8a/0x170 arch/x86/mm/physaddr.c:28
 virt_to_folio include/linux/mm.h:1178 [inline]
 kfree+0x43/0x1a0 mm/slab_common.c:1007
 tomoyo_realpath_from_path+0x5a3/0x5e0 security/tomoyo/realpath.c:286
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x28d/0x700 security/tomoyo/file.c:822
 security_inode_getattr+0xd3/0x120 security/security.c:2114
 vfs_getattr fs/stat.c:167 [inline]
 vfs_statx+0x18f/0x480 fs/stat.c:242
 vfs_fstatat fs/stat.c:276 [inline]
 __do_sys_newfstatat fs/stat.c:446 [inline]
 __se_sys_newfstatat fs/stat.c:440 [inline]
 __x64_sys_newfstatat+0x14f/0x1d0 fs/stat.c:440
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f769b3165f4
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007ffce397e0f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007f769b3ee460 RCX: 00007f769b3165f4
RDX: 00007ffce397e100 RSI: 00007f769b3b3130 RDI: 0000000000000009
RBP: 000055be015eb0d0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000001000 R11: 0000000000000206 R12: 0000000000000002
R13: 0000000000000002 R14: 000055be015eb0d0 R15: 000055be00d6dea6
 </TASK>

Allocated by task 30275:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4f/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:196 [inline]
 __do_kmalloc_node mm/slab_common.c:966 [inline]
 __kmalloc_node+0xb8/0x230 mm/slab_common.c:973
 kmalloc_node include/linux/slab.h:579 [inline]
 kvmalloc_node+0x72/0x180 mm/util.c:604
 kvmalloc include/linux/slab.h:697 [inline]
 kvzalloc include/linux/slab.h:705 [inline]
 alloc_netdev_mqs+0x89/0xf30 net/core/dev.c:10626
 rtnl_create_link+0x2f7/0xc00 net/core/rtnetlink.c:3315
 rtnl_newlink_create net/core/rtnetlink.c:3433 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3660 [inline]
 rtnl_newlink+0x1379/0x2010 net/core/rtnetlink.c:3673
 rtnetlink_rcv_msg+0x825/0xf40 net/core/rtnetlink.c:6395
 netlink_rcv_skb+0x1df/0x430 net/netlink/af_netlink.c:2546
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0x7c3/0x990 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0xa2a/0xd60 net/netlink/af_netlink.c:1913
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg net/socket.c:747 [inline]
 ____sys_sendmsg+0x58f/0x890 net/socket.c:2503
 ___sys_sendmsg net/socket.c:2557 [inline]
 __sys_sendmsg+0x2ad/0x390 net/socket.c:2586
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:491
 insert_work+0x54/0x3d0 kernel/workqueue.c:1365
 __queue_work+0xb37/0xf10 kernel/workqueue.c:1526
 call_timer_fn+0x178/0x580 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1746 [inline]
 __run_timers+0x67a/0x860 kernel/time/timer.c:2022
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
 __do_softirq+0x2ab/0x908 kernel/softirq.c:571

Second to last potentially related work creation:
 kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:491
 insert_work+0x54/0x3d0 kernel/workqueue.c:1365
 __queue_work+0xb37/0xf10 kernel/workqueue.c:1526
 call_timer_fn+0x178/0x580 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1746 [inline]
 __run_timers+0x67a/0x860 kernel/time/timer.c:2022
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
 __do_softirq+0x2ab/0x908 kernel/softirq.c:571

The buggy address belongs to the object at ffff888085918000
 which belongs to the cache kmalloc-cg-8k of size 8192
The buggy address is located 5376 bytes inside of
 freed 8192-byte region [ffff888085918000, ffff88808591a000)

The buggy address belongs to the physical page:
page:ffffea0002164600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888085918000 pfn:0x85918
head:ffffea0002164600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88801efe3121
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000010200 ffff88801244f640 ffffea000054b210 ffffea0000e54810
raw: ffff888085918000 0000000000020000 00000001ffffffff ffff88801efe3121
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 30275, tgid 30217 (syz-executor.4), ts 1565372236837, free_ts 1564410907123
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1731
 prep_new_page mm/page_alloc.c:1738 [inline]
 get_page_from_freelist+0x321c/0x33a0 mm/page_alloc.c:3502
 __alloc_pages+0x255/0x670 mm/page_alloc.c:4768
 alloc_slab_page+0x6a/0x160 mm/slub.c:1851
 allocate_slab mm/slub.c:1998 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2051
 ___slab_alloc+0xa85/0x10a0 mm/slub.c:3192
 __slab_alloc mm/slub.c:3291 [inline]
 __slab_alloc_node mm/slub.c:3344 [inline]
 slab_alloc_node mm/slub.c:3441 [inline]
 __kmem_cache_alloc_node+0x1b8/0x290 mm/slub.c:3490
 __do_kmalloc_node mm/slab_common.c:965 [inline]
 __kmalloc_node+0xa7/0x230 mm/slab_common.c:973
 kmalloc_node include/linux/slab.h:579 [inline]
 kvmalloc_node+0x72/0x180 mm/util.c:604
 kvmalloc include/linux/slab.h:697 [inline]
 kvzalloc include/linux/slab.h:705 [inline]
 alloc_netdev_mqs+0x89/0xf30 net/core/dev.c:10626
 rtnl_create_link+0x2f7/0xc00 net/core/rtnetlink.c:3315
 rtnl_newlink_create net/core/rtnetlink.c:3433 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3660 [inline]
 rtnl_newlink+0x1379/0x2010 net/core/rtnetlink.c:3673
 rtnetlink_rcv_msg+0x825/0xf40 net/core/rtnetlink.c:6395
 netlink_rcv_skb+0x1df/0x430 net/netlink/af_netlink.c:2546
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0x7c3/0x990 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0xa2a/0xd60 net/netlink/af_netlink.c:1913
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1302 [inline]
 free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2564
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2659
 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185
 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292
 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:711
 slab_alloc_node mm/slub.c:3451 [inline]
 __kmem_cache_alloc_node+0x14c/0x290 mm/slub.c:3490
 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1057
 kmalloc include/linux/slab.h:559 [inline]
 syslog_print+0x121/0x9b0 kernel/printk/printk.c:1553
 do_syslog+0x8c1/0x9b0 kernel/printk/printk.c:1732
 __do_sys_syslog kernel/printk/printk.c:1824 [inline]
 __se_sys_syslog kernel/printk/printk.c:1822 [inline]
 __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1822
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888085919400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888085919480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888085919500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888085919580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888085919600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	8b 15 10 25 78 7e    	mov    0x7e782510(%rip),%edx        # 0x7e782516
   6:	65 8b 05 11 25 78 7e 	mov    %gs:0x7e782511(%rip),%eax        # 0x7e78251e
   d:	a9 00 01 ff 00       	test   $0xff0100,%eax
  12:	74 10                	je     0x24
  14:	a9 00 01 00 00       	test   $0x100,%eax
  19:	74 5b                	je     0x76
  1b:	83 ba 0c 16 00 00 00 	cmpl   $0x0,0x160c(%rdx)
  22:	74 52                	je     0x76
  24:	8b 82 e8 15 00 00    	mov    0x15e8(%rdx),%eax
* 2a:	83 f8 03             	cmp    $0x3,%eax <-- trapping instruction
  2d:	75 47                	jne    0x76
  2f:	48 8b 8a f0 15 00 00 	mov    0x15f0(%rdx),%rcx
  36:	44 8b 8a ec 15 00 00 	mov    0x15ec(%rdx),%r9d
  3d:	49                   	rex.WB
  3e:	c1                   	.byte 0xc1
  3f:	e1                   	.byte 0xe1