watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz-executor.2:25720] Modules linked in: irq event stamp: 5681479 hardirqs last enabled at (5681478): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (5681479): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (0): [] copy_process.part.0+0x15b9/0x8260 kernel/fork.c:1855 softirqs last disabled at (1657): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (1657): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 1 PID: 25720 Comm: syz-executor.2 Not tainted 4.19.190-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:unwind_done arch/x86/include/asm/unwind.h:46 [inline] RIP: 0010:unwind_get_return_address+0xa/0x90 arch/x86/kernel/unwind_orc.c:294 Code: 34 24 e9 3c ff ff ff e8 34 a3 6e 00 eb b4 e8 2d a3 6e 00 eb 80 66 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df <48> 89 fa 55 48 c1 ea 03 53 48 89 fb 0f b6 04 02 84 c0 74 04 3c 03 RSP: 0018:ffff8880ba1078a0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffffffff815368b7 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffff8880ba107718 RDI: ffff8880ba1078b8 RBP: ffff8880ba107938 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8880ba107917 R11: 0000000000074071 R12: ffff8880ba107950 R13: 0000000000000000 R14: ffff8880b5b9c900 R15: 00000000000000e8 FS: 00007fe9ef8f9700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000484 CR3: 0000000015695000 CR4: 00000000001406e0 DR0: 00000000000000ff DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __save_stack_trace+0xaf/0x190 arch/x86/kernel/stacktrace.c:45 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 kmem_cache_alloc_node+0x146/0x3b0 mm/slab.c:3649 __alloc_skb+0x71/0x560 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:995 [inline] mrp_pdu_init net/802/mrp.c:303 [inline] mrp_pdu_append_vecattr_event+0x7d2/0x1050 net/802/mrp.c:402 mrp_attr_event+0x15d/0x220 net/802/mrp.c:497 mrp_mad_event net/802/mrp.c:577 [inline] mrp_join_timer+0x5a/0xc0 net/802/mrp.c:594 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:535 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:lock_acquire+0x1ec/0x3c0 kernel/locking/lockdep.c:3911 Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 b7 01 00 00 48 83 3d 69 4e a6 08 00 0f 84 2a 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b RSP: 0018:ffff8880156f7c88 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3049 RBX: ffff88803536a180 RCX: 0000000000004faa RDX: dffffc0000000000 RSI: 000000005b8a9804 RDI: 0000000000000282 RBP: ffff8880a8ba6b68 R08: ffffffff8cd3d290 R09: 0000000000000003 R10: ffff88803536aa80 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] task_lock include/linux/sched/task.h:147 [inline] chroot_fs_refs+0xe7/0x580 fs/fs_struct.c:65 __do_sys_pivot_root fs/namespace.c:3162 [inline] __se_sys_pivot_root+0xc8d/0x11c0 fs/namespace.c:3082 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe9ef8f9188 EFLAGS: 00000246 ORIG_RAX: 000000000000009b RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000020000300 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd2c8495af R14: 00007fe9ef8f9300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 25725 Comm: syz-executor.4 Not tainted 4.19.190-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:261 [inline] RIP: 0010:queued_write_lock_slowpath+0x11f/0x290 kernel/locking/qrwlock.c:88 Code: 03 41 83 e7 07 4c 8d 2c 02 41 83 c7 03 41 0f b6 45 00 41 38 c7 7c 08 84 c0 0f 85 34 01 00 00 8b 03 3d 00 01 00 00 74 1a f3 90 <41> 0f b6 45 00 41 38 c7 7c eb 84 c0 74 e7 48 89 df e8 eb 42 4c 00 RSP: 0018:ffff8880156efa38 EFLAGS: 00000006 RAX: 0000000000000300 RBX: ffffffff89e09080 RCX: ffffffff814bde26 RDX: 1ffffffff13c1210 RSI: 0000000000000004 RDI: ffffffff89e09080 RBP: 1ffff11002addf48 R08: 0000000000000001 R09: fffffbfff13c1210 R10: ffffffff89e09083 R11: 0000000000000000 R12: ffffffff89e09084 R13: fffffbfff13c1210 R14: ffff8880156efa60 R15: 0000000000000003 FS: 00007f645e069700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000440 CR3: 00000000aa63e000 CR4: 00000000001406f0 DR0: 00000000000000ff DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: queued_write_lock include/asm-generic/qrwlock.h:103 [inline] do_raw_write_lock+0xcf/0x1e0 kernel/locking/spinlock_debug.c:203 exit_notify kernel/exit.c:715 [inline] do_exit+0xc41/0x2be0 kernel/exit.c:890 do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f645e069218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000056c010 RCX: 00000000004665d9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000056c014 RBP: 000000000056c008 R08: 0000000000000016 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000056c014 R13: 00007fff78d8656f R14: 00007f645e069300 R15: 0000000000022000