------------[ cut here ]------------ ODEBUG: free active (active state 1) object type: rcu_head hint: (null) WARNING: CPU: 1 PID: 24517 at lib/debugobjects.c:325 debug_print_object+0x168/0x250 lib/debugobjects.c:325 kobject: 'loop2' (0000000041d4573b): kobject_uevent_env Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 24517 Comm: syz-executor.0 Not tainted 4.19.75 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 panic+0x263/0x507 kernel/panic.c:185 kobject: 'loop2' (0000000041d4573b): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop3' (000000005def7034): kobject_uevent_env kobject: 'loop3' (000000005def7034): fill_kobj_path: path = '/devices/virtual/block/loop3' __warn.cold+0x20/0x4a kernel/panic.c:540 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [inline] do_error_trap+0x204/0x360 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037 RIP: 0010:debug_print_object+0x168/0x250 lib/debugobjects.c:325 Code: dd 20 56 82 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 8b 14 dd 20 56 82 87 48 c7 c7 60 4b 82 87 e8 d6 04 19 fe <0f> 0b 83 05 cb 83 17 06 01 48 83 c4 20 5b 41 5c 41 5d 41 5e 5d c3 RSP: 0018:ffff88805a08f388 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff8155dbd6 RDI: ffffed100b411e63 RBP: ffff88805a08f3c8 R08: ffff88805a76a4c0 R09: ffffed1015d23ee3 R10: ffffed1015d23ee2 R11: ffff8880ae91f717 R12: 0000000000000001 R13: ffffffff8879f200 R14: 0000000000000000 R15: ffff88804b277660 __debug_check_no_obj_freed lib/debugobjects.c:785 [inline] debug_check_no_obj_freed+0x29f/0x464 lib/debugobjects.c:817 kmem_cache_free+0x18f/0x260 mm/slab.c:3764 free_task_struct kernel/fork.c:162 [inline] free_task+0xdd/0x120 kernel/fork.c:416 __put_task_struct+0x20f/0x4c0 kernel/fork.c:689 put_task_struct include/linux/sched/task.h:96 [inline] finish_task_switch+0x52b/0x780 kernel/sched/core.c:2710 context_switch kernel/sched/core.c:2829 [inline] __schedule+0x86e/0x1dc0 kernel/sched/core.c:3474 preempt_schedule_common+0x4f/0xe0 kernel/sched/core.c:3598 preempt_schedule+0x4b/0x60 kernel/sched/core.c:3624 ___preempt_schedule+0x16/0x18 __kunmap_atomic include/linux/highmem.h:78 [inline] clear_highpage include/linux/highmem.h:191 [inline] prep_new_page mm/page_alloc.c:1939 [inline] get_page_from_freelist+0x2f71/0x4410 mm/page_alloc.c:3366 __alloc_pages_nodemask+0x308/0x750 mm/page_alloc.c:4389 alloc_pages_current+0x107/0x210 mm/mempolicy.c:2193 alloc_pages include/linux/gfp.h:509 [inline] __vmalloc_area_node mm/vmalloc.c:1690 [inline] __vmalloc_node_range+0x4ac/0x790 mm/vmalloc.c:1750 __vmalloc_node mm/vmalloc.c:1801 [inline] __vmalloc_node_flags_caller+0x71/0x90 mm/vmalloc.c:1823 kvmalloc_node+0xdc/0x100 mm/util.c:432 kvmalloc include/linux/mm.h:577 [inline] kvmalloc_array include/linux/mm.h:595 [inline] xt_alloc_entry_offsets+0x3f/0x50 net/netfilter/x_tables.c:954 translate_table+0x21c/0x1860 net/ipv6/netfilter/ip6_tables.c:699 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline] do_ip6t_set_ctl+0x2ef/0x498 net/ipv6/netfilter/ip6_tables.c:1684 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x77/0xd0 net/netfilter/nf_sockopt.c:115 ipv6_setsockopt net/ipv6/ipv6_sockglue.c:938 [inline] ipv6_setsockopt+0x13e/0x170 net/ipv6/ipv6_sockglue.c:922 tcp_setsockopt net/ipv4/tcp.c:3077 [inline] tcp_setsockopt+0x8f/0xe0 net/ipv4/tcp.c:3071 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3041 __sys_setsockopt+0x17a/0x280 net/socket.c:1901 __do_sys_setsockopt net/socket.c:1912 [inline] __se_sys_setsockopt net/socket.c:1909 [inline] __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1909 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a29 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa9b9fc9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459a29 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000002 R09: 0000000000000000 R10: 0000000020000180 R11: 0000000000000246 R12: 00007fa9b9fca6d4 R13: 00000000004cee30 R14: 00000000004dd800 R15: 00000000ffffffff ======================================================