capability: warning: `syz-executor.4' uses 32-bit capabilities (legacy support in use) ------------[ cut here ]------------ ODEBUG: free active (active state 1) object type: rcu_head hint: (null) WARNING: CPU: 1 PID: 7560 at lib/debugobjects.c:325 debug_print_object+0x168/0x250 lib/debugobjects.c:325 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 7560 Comm: syz-executor.5 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: 'loop4' (00000000947f2b10): kobject_uevent_env kobject: 'loop4' (00000000947f2b10): fill_kobj_path: path = '/devices/virtual/block/loop4' __warn.cold+0x20/0x4a kernel/panic.c:540 kobject: 'loop1' (000000004c74cda0): kobject_uevent_env 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 kobject: 'loop1' (000000004c74cda0): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (0000000026180d91): kobject_uevent_env kobject: 'loop0' (0000000026180d91): fill_kobj_path: path = '/devices/virtual/block/loop0' 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 kobject: 'loop2' (0000000073944356): kobject_uevent_env RSP: 0018:ffff88805aa5f9d0 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8155dbd6 RDI: ffffed100b54bf2c RBP: ffff88805aa5fa10 R08: ffff88805aa52580 R09: ffffed1015d23ee3 R10: ffffed1015d23ee2 R11: ffff8880ae91f717 R12: 0000000000000001 R13: ffffffff8879f200 R14: 0000000000000000 R15: ffff88808db57420 __debug_check_no_obj_freed lib/debugobjects.c:785 [inline] debug_check_no_obj_freed+0x29f/0x464 lib/debugobjects.c:817 kobject: 'loop2' (0000000073944356): fill_kobj_path: path = '/devices/virtual/block/loop2' 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 ------------[ cut here ]------------ ODEBUG: free active (active state 1) object type: rcu_head hint: (null) WARNING: CPU: 0 PID: 7547 at lib/debugobjects.c:325 debug_print_object+0x168/0x250 lib/debugobjects.c:325 Modules linked in: schedule+0x92/0x1c0 kernel/sched/core.c:3518 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x201/0x690 kernel/time/hrtimer.c:1688 CPU: 0 PID: 7547 Comm: syz-executor.1 Not tainted 4.19.75 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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:ffff88808f89f9d0 EFLAGS: 00010082 hrtimer_nanosleep+0x2a6/0x570 kernel/time/hrtimer.c:1742 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8155dbd6 RDI: ffffed1011f13f2c RBP: ffff88808f89fa10 R08: ffff88808f2be280 R09: ffffed1015d03ee3 R10: ffffed1015d03ee2 R11: ffff8880ae81f717 R12: 0000000000000002 __do_sys_nanosleep kernel/time/hrtimer.c:1776 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1763 [inline] __x64_sys_nanosleep+0x1a6/0x220 kernel/time/hrtimer.c:1763 R13: ffffffff8879f200 R14: 0000000000000000 R15: ffff888052c274e0 FS: 0000555556c04940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2bd23000 CR3: 000000008d1f8000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 entry_SYSCALL_64_after_hwframe+0x49/0xbe Call Trace: RIP: 0033:0x457ed0 __debug_check_no_obj_freed lib/debugobjects.c:785 [inline] debug_check_no_obj_freed+0x29f/0x464 lib/debugobjects.c:817 Code: c0 5b 5d c3 66 0f 1f 44 00 00 8b 04 24 48 83 c4 18 5b 5d c3 66 0f 1f 44 00 00 83 3d 81 e8 61 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 24 d3 fb ff c3 48 83 ec 08 e8 ea 46 00 00 kmem_cache_free+0x18f/0x260 mm/slab.c:3764 RSP: 002b:00007ffeb739f0a8 EFLAGS: 00000246 free_task_struct kernel/fork.c:162 [inline] free_task+0xdd/0x120 kernel/fork.c:416 ORIG_RAX: 0000000000000023 __put_task_struct+0x20f/0x4c0 kernel/fork.c:689 RAX: ffffffffffffffda RBX: 0000000000030fbe RCX: 0000000000457ed0 put_task_struct include/linux/sched/task.h:96 [inline] finish_task_switch+0x52b/0x780 kernel/sched/core.c:2710 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffeb739f0b0 context_switch kernel/sched/core.c:2829 [inline] __schedule+0x86e/0x1dc0 kernel/sched/core.c:3474 RBP: 0000000000000035 R08: 0000000000000001 R09: 00005555567f5940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00007ffeb739f100 R14: 0000000000030f7f R15: 00007ffeb739f110 ======================================================