list_add corruption. prev->next should be next (ffff8881f725c060), but was ffff888112e29870. (prev=ffff888112e29870). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:28! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 423 Comm: syz-executor.2 Tainted: G W 5.10.117-syzkaller-986967-g0974b8411a58-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_add_valid+0xc6/0xd0 lib/list_debug.c:26 Code: 48 c7 c7 40 db 43 85 4c 89 e6 4c 89 f1 31 c0 e8 ad 2b 40 02 0f 0b 48 c7 c7 00 dc 43 85 4c 89 f6 4c 89 e1 31 c0 e8 97 2b 40 02 <0f> 0b 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 54 53 49 RSP: 0018:ffffc90000007a00 EFLAGS: 00010046 RAX: 0000000000000075 RBX: ffff8881f725c068 RCX: d6a1f122e57fa000 RDX: 0000000000000102 RSI: 0000000000000102 RDI: 0000000000000000 RBP: ffffc90000007a28 R08: ffffffff8153a998 R09: ffffed103ee44e83 R10: ffffed103ee44e83 R11: 1ffff1103ee44e82 R12: ffff888112e29870 R13: dffffc0000000000 R14: ffff8881f725c060 R15: ffff888112e29870 FS: 0000555555cf8400(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f46e63de280 CR3: 00000001085ed000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_add include/linux/list.h:67 [inline] list_add_tail include/linux/list.h:100 [inline] insert_work+0x107/0x330 kernel/workqueue.c:1352 __queue_work+0x971/0xd30 kernel/workqueue.c:1514 queue_work_on+0xf2/0x150 kernel/workqueue.c:1541 queue_work include/linux/workqueue.h:513 [inline] css_release+0xae/0xc0 kernel/cgroup/cgroup.c:5161 percpu_ref_put_many include/linux/percpu-refcount.h:322 [inline] percpu_ref_put include/linux/percpu-refcount.h:338 [inline] percpu_ref_call_confirm_rcu lib/percpu-refcount.c:162 [inline] percpu_ref_switch_to_atomic_rcu+0x5a2/0x5b0 lib/percpu-refcount.c:199 rcu_do_batch+0x59e/0xc40 kernel/rcu/tree.c:2485 rcu_core+0x59b/0xe30 kernel/rcu/tree.c:2726 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2739 __do_softirq+0x27e/0x596 kernel/softirq.c:305 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:402 [inline] __irq_exit_rcu+0x128/0x150 kernel/softirq.c:432 irq_exit_rcu+0x9/0x10 kernel/softirq.c:444 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1095 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline] RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline] RIP: 0010:console_unlock+0xb5c/0xf20 kernel/printk/printk.c:2555 Code: 85 db 4c 8d b4 24 60 01 00 00 0f 85 82 03 00 00 e8 49 6e 00 00 48 8b 44 24 30 48 89 84 24 90 00 00 00 ff b4 24 90 00 00 00 9d <48> 8b 44 24 38 42 80 3c 38 00 74 08 4c 89 f7 e8 f0 e0 52 00 48 c7 RSP: 0018:ffffc90000c976c0 EFLAGS: 00000246 RAX: 0000000000000246 RBX: 0000000000000000 RCX: ffff88810c290000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc90000c97950 R08: ffffffff8153a4db R09: 0000000000000003 R10: fffff52000192ec9 R11: 1ffff92000192ec8 R12: ffffc90000c978c0 R13: 1ffffffff0c3ad81 R14: ffffc90000c97820 R15: dffffc0000000000 vprintk_emit+0x44b/0x640 kernel/printk/printk.c:2063 vprintk_default+0x26/0x30 kernel/printk/printk.c:2080 vprintk_func+0x19d/0x1e0 kernel/printk/printk_safe.c:401 printk+0xcf/0x10f kernel/printk/printk.c:2111 print_modules+0xf8/0x1f0 kernel/module.c:4777 __warn+0xf5/0x260 kernel/panic.c:592 report_bug+0x410/0x580 lib/bug.c:197 handle_bug+0x41/0x70 arch/x86/kernel/traps.c:235 exc_invalid_op+0x1b/0x50 arch/x86/kernel/traps.c:255 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:569 RIP: 0010:cleanup_mnt+0x4c5/0x510 fs/namespace.c:1109 Code: 01 a1 ff 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 4e 06 b5 ff 48 8b 7d d0 e8 c5 07 05 00 e9 21 fd ff ff e8 3b 06 b5 ff <0f> 0b e9 e5 fc ff ff 48 c7 c1 58 db 5e 86 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc90000c97e30 EFLAGS: 00010293 RAX: ffffffff81b7ac15 RBX: ffffe8ffffd49fcc RCX: ffff88810c290000 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000 RBP: ffffc90000c97e80 R08: ffffffff81b7a8f3 R09: 0000000000000003 R10: fffff52000192fc5 R11: 1ffff92000192fc4 R12: ffff888121b1b728 R13: 0000000000000008 R14: dffffc0000000000 R15: 00000000ffffffff __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x147/0x1b0 kernel/task_work.c:154 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xc8/0xe0 kernel/entry/common.c:164 exit_to_user_mode_prepare kernel/entry/common.c:191 [inline] syscall_exit_to_user_mode+0x77/0xa0 kernel/entry/common.c:266 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f0c7456e557 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc9ba36c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f0c7456e557 RDX: 00007ffc9ba36d49 RSI: 000000000000000a RDI: 00007ffc9ba36d40 RBP: 00007ffc9ba36d40 R08: 00000000ffffffff R09: 00007ffc9ba36b10 R10: 0000555555cf9ba3 R11: 0000000000000246 R12: 00007f0c745c61f8 R13: 00007ffc9ba37e00 R14: 0000555555cf9b00 R15: 00007ffc9ba37e40 Modules linked in: ---[ end trace 8a172ed32f86a6e9 ]--- RIP: 0010:__list_add_valid+0xc6/0xd0 lib/list_debug.c:26 Code: 48 c7 c7 40 db 43 85 4c 89 e6 4c 89 f1 31 c0 e8 ad 2b 40 02 0f 0b 48 c7 c7 00 dc 43 85 4c 89 f6 4c 89 e1 31 c0 e8 97 2b 40 02 <0f> 0b 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 54 53 49 RSP: 0018:ffffc90000007a00 EFLAGS: 00010046 RAX: 0000000000000075 RBX: ffff8881f725c068 RCX: d6a1f122e57fa000 RDX: 0000000000000102 RSI: 0000000000000102 RDI: 0000000000000000 RBP: ffffc90000007a28 R08: ffffffff8153a998 R09: ffffed103ee44e83 R10: ffffed103ee44e83 R11: 1ffff1103ee44e82 R12: ffff888112e29870 R13: dffffc0000000000 R14: ffff8881f725c060 R15: ffff888112e29870 FS: 0000555555cf8400(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f46e63de280 CR3: 00000001085ed000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 85 db test %ebx,%ebx 2: 4c 8d b4 24 60 01 00 lea 0x160(%rsp),%r14 9: 00 a: 0f 85 82 03 00 00 jne 0x392 10: e8 49 6e 00 00 callq 0x6e5e 15: 48 8b 44 24 30 mov 0x30(%rsp),%rax 1a: 48 89 84 24 90 00 00 mov %rax,0x90(%rsp) 21: 00 22: ff b4 24 90 00 00 00 pushq 0x90(%rsp) 29: 9d popfq * 2a: 48 8b 44 24 38 mov 0x38(%rsp),%rax <-- trapping instruction 2f: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 34: 74 08 je 0x3e 36: 4c 89 f7 mov %r14,%rdi 39: e8 f0 e0 52 00 callq 0x52e12e 3e: 48 rex.W 3f: c7 .byte 0xc7