audit: type=1800 audit(1631992595.022:553): pid=6587 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="bus" dev="sda1" ino=14411 res=0 IPv6: ADDRCONF(NETDEV_UP): vlan527: link is not ready netlink: 24 bytes leftover after parsing attributes in process `syz-executor.4'. watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor.0:6500] Modules linked in: irq event stamp: 3769437 hardirqs last enabled at (3769436): [<ffffffff81003ce4>] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (3769437): [<ffffffff81003d00>] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (17538): [<ffffffff88400678>] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (17541): [<ffffffff81393705>] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (17541): [<ffffffff81393705>] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 1 PID: 6500 Comm: syz-executor.0 Not tainted 4.19.206-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x20 kernel/kcov.c:162 Code: b6 d6 40 0f b6 f7 31 ff eb 80 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 02 00 00 00 e9 6c ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 <48> 8b 0c 24 89 f2 89 fe bf 04 00 00 00 e9 4e ff ff ff 66 66 2e 0f RSP: 0018:ffff8880ba1075f8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 000000000000003f RBX: ffff8880ba107738 RCX: ffffffff8703dc7f RDX: 0000000000000100 RSI: 0000000000000060 RDI: 0000000000000000 RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000006 R11: ffffffff87023760 R12: 0000000000000009 R13: 0000000000000060 R14: fc01000000000000 R15: 0000000000000000 FS: 00007fc613a69700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1f94041718 CR3: 0000000009e6d000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> ipv6_get_saddr_eval+0xd85/0x1020 net/ipv6/addrconf.c:1575 __ipv6_dev_get_saddr+0x20b/0x5f0 net/ipv6/addrconf.c:1639 ipv6_dev_get_saddr+0x56c/0xc20 net/ipv6/addrconf.c:1774 ip6_route_get_saddr include/net/ip6_route.h:124 [inline] ip6_dst_lookup_tail+0x1233/0x19b0 net/ipv6/ip6_output.c:997 ip6_dst_lookup_flow+0x8c/0x1d0 net/ipv6/ip6_output.c:1120 tipc_udp_xmit+0x2c4/0xc10 net/tipc/udp_media.c:192 tipc_udp_send_msg+0x279/0x490 net/tipc/udp_media.c:248 tipc_bearer_xmit_skb+0x15b/0x330 net/tipc/bearer.c:518 tipc_disc_timeout+0x855/0xc90 net/tipc/discover.c:332 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 </IRQ> RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:97 Code: ff 48 89 df e8 11 d3 35 00 e9 ab fe ff ff 4c 89 ef e8 04 d3 35 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <48> 8b 34 24 65 48 8b 04 25 c0 df 01 00 65 8b 15 7c 4c 9f 7e 81 e2 RSP: 0018:ffff88801423f768 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff818ba2ae RDX: 0000000000000000 RSI: ffff888098b46140 RDI: 0000000000000001 RBP: ffffea00027861c8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: ffffea00027861c0 R14: dffffc0000000000 R15: 00007fc61435d000 __read_once_size include/linux/compiler.h:261 [inline] compound_head include/linux/page-flags.h:142 [inline] PageSwapBacked include/linux/page-flags.h:295 [inline] mm_counter_file include/linux/mm.h:1642 [inline] mm_counter include/linux/mm.h:1651 [inline] zap_pte_range mm/memory.c:1349 [inline] zap_pmd_range mm/memory.c:1463 [inline] zap_pud_range mm/memory.c:1492 [inline] zap_p4d_range mm/memory.c:1513 [inline] unmap_page_range+0x136b/0x2c50 mm/memory.c:1534 unmap_single_vma+0x198/0x300 mm/memory.c:1579 unmap_vmas+0xa9/0x180 mm/memory.c:1609 exit_mmap+0x2b9/0x530 mm/mmap.c:3093 __mmput kernel/fork.c:1015 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1036 exit_mm kernel/exit.c:549 [inline] do_exit+0xaec/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: 0033:0x7fc6164f2739 Code: Bad RIP value. RSP: 002b:00007fc613a69188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: 0000000000000012 RBX: 00007fc6165f6f80 RCX: 00007fc6164f2739 RDX: 0000000000000012 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00007fc61654ccc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc6165f6f80 R13: 00007ffd8bb5d05f R14: 00007fc613a69300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 ---------------- Code disassembly (best guess): 0: b6 d6 mov $0xd6,%dh 2: 40 0f b6 f7 movzbl %dil,%esi 6: 31 ff xor %edi,%edi 8: eb 80 jmp 0xffffff8a a: 48 8b 0c 24 mov (%rsp),%rcx e: 0f b7 d6 movzwl %si,%edx 11: 0f b7 f7 movzwl %di,%esi 14: bf 02 00 00 00 mov $0x2,%edi 19: e9 6c ff ff ff jmpq 0xffffff8a 1e: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 25: 00 00 00 00 29: 90 nop * 2a: 48 8b 0c 24 mov (%rsp),%rcx <-- trapping instruction 2e: 89 f2 mov %esi,%edx 30: 89 fe mov %edi,%esi 32: bf 04 00 00 00 mov $0x4,%edi 37: e9 4e ff ff ff jmpq 0xffffff8a 3c: 66 data16 3d: 66 data16 3e: 2e cs 3f: 0f .byte 0xf