watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor.1:20267] Modules linked in: irq event stamp: 3928067 hardirqs last enabled at (3928066): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (3928067): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (969580): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (969583): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (969583): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 1 PID: 20267 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:find_stack lib/stackdepot.c:193 [inline] RIP: 0010:depot_save_stack+0x122/0x410 lib/stackdepot.c:242 Code: 81 e5 ff ff 0f 00 4a 8b 2c ed c0 0c 47 8d 48 85 ed 75 12 e9 b6 00 00 00 48 8b 6d 00 48 85 ed 0f 84 a9 00 00 00 39 5d 08 75 ee <3b> 7d 0c 75 e9 31 c0 48 8b 54 c5 18 48 39 14 c1 75 dc 48 83 c0 01 RSP: 0018:ffff8880ba107440 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 00000000affa5b7f RBX: 00000000875fa60e RCX: ffff8880ba1074a0 RDX: 00000000d017e22c RSI: 000000000000000b RDI: 000000000000000b RBP: ffff888097dfd1d0 R08: 0000000000490220 R09: 0000000000000001 R10: 00000000f04c3606 R11: 0000000024489f40 R12: ffff8880ba107488 R13: 00000000000fa60e R14: ffff88813bff0ac0 R15: 0000000000000280 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556235708 CR3: 0000000099e73000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: save_stack mm/kasan/kasan.c:454 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0x139/0x160 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3689 [inline] __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703 __kmalloc_reserve net/core/skbuff.c:137 [inline] __alloc_skb+0xae/0x560 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:995 [inline] sctp_packet_transmit+0x246/0x3660 net/sctp/output.c:584 sctp_outq_flush_transports+0x19d/0x340 net/sctp/outqueue.c:1166 sctp_outq_flush net/sctp/outqueue.c:1214 [inline] sctp_outq_uncork+0x185/0x200 net/sctp/outqueue.c:777 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1328 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x3c9d/0x5110 net/sctp/sm_sideeffect.c:1170 sctp_generate_heartbeat_event+0x2af/0x490 net/sctp/sm_sideeffect.c:406 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:536 [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:__read_once_size include/linux/compiler.h:263 [inline] RIP: 0010:mm_update_next_owner+0x3ca/0x650 kernel/exit.c:452 Code: 03 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 52 02 00 00 48 8b ad 30 03 00 00 4c 8d 6d 10 4c 89 e8 48 c1 e8 03 80 3c 18 00 <0f> 85 29 02 00 00 48 8b 45 10 48 8d a8 70 fa ff ff 49 39 c5 75 47 RSP: 0018:ffff88802e49fa98 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff11012ce8b42 RBX: dffffc0000000000 RCX: ffffffff8138bd9e RDX: 0000000000000000 RSI: ffffffff8138bdac RDI: ffff8880954b2a00 RBP: ffff888096745a00 R08: ffff88808f254560 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff88809fad5000 R13: ffff888096745a10 R14: ffff88801e6ac1c0 R15: ffff888090372fc0 exit_mm kernel/exit.c:548 [inline] do_exit+0xae4/0x2be0 kernel/exit.c:857 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: 0033:0x7f53af230e99 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:00007f53adba6218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f53af343f68 RCX: 00007f53af230e99 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f53af343f68 RBP: 00007f53af343f60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f53af343f6c R13: 00007ffd7adda2ff R14: 00007f53adba6300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 20332 Comm: syz-executor.0 Not tainted 4.19.211-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:263 [inline] RIP: 0010:queued_write_lock_slowpath+0x124/0x290 kernel/locking/qrwlock.c:88 Code: 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 ab 62 4c 00 eb dd 48 89 df RSP: 0018:ffff8880b4c77e18 EFLAGS: 00000006 RAX: 0000000000000000 RBX: ffffffff89e09080 RCX: ffffffff814bfec6 RDX: 1ffffffff13c1210 RSI: 0000000000000004 RDI: ffffffff89e09080 RBP: 1ffff1101698efc4 R08: 0000000000000001 R09: fffffbfff13c1210 R10: ffffffff89e09083 R11: 0000000000000000 R12: ffffffff89e09084 R13: fffffbfff13c1210 R14: ffff8880b4c77e40 R15: 0000000000000003 FS: 0000555556235400(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2deb7bcdb0 CR3: 00000000b4ee1000 CR4: 00000000003426f0 DR0: 0000000000000000 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 __do_sys_setpgid kernel/sys.c:1021 [inline] __se_sys_setpgid+0xe7/0x760 kernel/sys.c:1003 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f2deb7bcdb7 Code: fd ff 90 b8 6b 00 00 00 0f 05 c3 0f 1f 84 00 00 00 00 00 b8 6c 00 00 00 0f 05 c3 0f 1f 84 00 00 00 00 00 b8 6d 00 00 00 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:00007ffe502ad858 EFLAGS: 00000246 ORIG_RAX: 000000000000006d RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2deb7bcdb7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000000 R09: 00007f2deb87cef0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffe502ad920 ---------------- Code disassembly (best guess): 0: 81 e5 ff ff 0f 00 and $0xfffff,%ebp 6: 4a 8b 2c ed c0 0c 47 mov -0x72b8f340(,%r13,8),%rbp d: 8d e: 48 85 ed test %rbp,%rbp 11: 75 12 jne 0x25 13: e9 b6 00 00 00 jmpq 0xce 18: 48 8b 6d 00 mov 0x0(%rbp),%rbp 1c: 48 85 ed test %rbp,%rbp 1f: 0f 84 a9 00 00 00 je 0xce 25: 39 5d 08 cmp %ebx,0x8(%rbp) 28: 75 ee jne 0x18 * 2a: 3b 7d 0c cmp 0xc(%rbp),%edi <-- trapping instruction 2d: 75 e9 jne 0x18 2f: 31 c0 xor %eax,%eax 31: 48 8b 54 c5 18 mov 0x18(%rbp,%rax,8),%rdx 36: 48 39 14 c1 cmp %rdx,(%rcx,%rax,8) 3a: 75 dc jne 0x18 3c: 48 83 c0 01 add $0x1,%rax