./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor956670543 <...> syzkaller syzkaller login: [ 6.761380][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! [ 10.531412][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! [ 10.841389][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! [ 10.993732][ T23] kauditd_printk_skb: 60 callbacks suppressed [ 10.993738][ T23] audit: type=1400 audit(1655516435.500:71): avc: denied { transition } for pid=290 comm="sshd" path="/bin/sh" dev="sda1" ino=73 scontext=system_u:system_r:initrc_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 11.000654][ T23] audit: type=1400 audit(1655516435.500:72): avc: denied { write } for pid=290 comm="sh" path="pipe:[11419]" dev="pipefs" ino=11419 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:initrc_t tclass=fifo_file permissive=1 [ 11.161568][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #288!!! Warning: Permanently added '10.128.10.26' (ECDSA) to the list of known hosts. execve("./syz-executor956670543", ["./syz-executor956670543"], 0x7ffcb3b833f0 /* 10 vars */) = 0 brk(NULL) = 0x555556de6000 brk(0x555556de6c40) = 0x555556de6c40 arch_prctl(ARCH_SET_FS, 0x555556de6300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 set_tid_address(0x555556de65d0) = 371 set_robust_list(0x555556de65e0, 24) = 0 rt_sigaction(SIGRTMIN, {sa_handler=0x7efe22a38380, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7efe22a38a50}, NULL, 8) = 0 rt_sigaction(SIGRT_1, {sa_handler=0x7efe22a38420, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7efe22a38a50}, NULL, 8) = 0 rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor956670543", 4096) = 27 brk(0x555556e07c40) = 0x555556e07c40 brk(0x555556e08000) = 0x555556e08000 mprotect(0x7efe22af8000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555556de65d0) = 372 ./strace-static-x86_64: Process 372 attached [pid 372] set_robust_list(0x555556de65e0, 24) = 0 [pid 372] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 372] setpgid(0, 0) = 0 [pid 372] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 372] write(3, "1000", 4) = 4 [pid 372] close(3) = 0 [pid 372] futex(0x7efe22afe42c, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 372] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7efe22a08000 [pid 372] mprotect(0x7efe22a09000, 131072, PROT_READ|PROT_WRITE) = 0 [pid 372] clone(child_stack=0x7efe22a283f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 373 attached , parent_tid=[373], tls=0x7efe22a28700, child_tidptr=0x7efe22a289d0) = 373 [pid 372] futex(0x7efe22afe428, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 372] futex(0x7efe22afe42c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 373] set_robust_list(0x7efe22a289e0, 24) = 0 [pid 373] openat(AT_FDCWD, "/dev/net/tun", O_RDONLY) = 3 [pid 373] futex(0x7efe22afe42c, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 373] futex(0x7efe22afe428, FUTEX_WAIT_PRIVATE, 0, NULL [pid 372] <... futex resumed>) = 0 [pid 372] futex(0x7efe22afe428, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 372] futex(0x7efe22afe42c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 373] <... futex resumed>) = 0 [pid 373] ioctl(3, TUNSETIFF, 0x20000200) = 0 [pid 373] futex(0x7efe22afe42c, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 372] <... futex resumed>) = 0 [pid 372] futex(0x7efe22afe428, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 372] futex(0x7efe22afe42c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 373] socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE) = 4 [pid 373] futex(0x7efe22afe42c, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 372] <... futex resumed>) = 0 [pid 373] socket(AF_PACKET, SOCK_DGRAM, htons(ETH_P_ALL) [pid 372] futex(0x7efe22afe428, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 372] futex(0x7efe22afe42c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 373] <... socket resumed>) = 5 [pid 373] futex(0x7efe22afe42c, FUTEX_WAKE_PRIVATE, 1000000 [pid 372] <... futex resumed>) = 0 [pid 372] futex(0x7efe22afe428, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 372] futex(0x7efe22afe42c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 373] <... futex resumed>) = 1 [pid 373] ioctl(3, TUNSETQUEUE, 0x20000000) = 0 [pid 373] futex(0x7efe22afe42c, FUTEX_WAKE_PRIVATE, 1000000 [pid 372] <... futex resumed>) = 0 [pid 372] futex(0x7efe22afe428, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 372] futex(0x7efe22afe42c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 373] <... futex resumed>) = 1 [pid 373] ioctl(5, SIOCGIFINDEX, {ifr_name="rose0", ifr_ifindex=15}) = 0 [pid 373] futex(0x7efe22afe42c, FUTEX_WAKE_PRIVATE, 1000000 [pid 372] <... futex resumed>) = 0 [pid 372] futex(0x7efe22afe428, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 372] futex(0x7efe22afe42c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 373] <... futex resumed>) = 1 [pid 373] sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\x34\x00\x00\x00\x11\x00\x01\xe9\x0d\x7d\x1f\x07\xde\x1c\x8b\x3e\xec\x45\xb2\xfc\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", iov_len=52}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0 [pid 372] <... futex resumed>) = -1 ETIMEDOUT (Connection timed out) [pid 372] futex(0x7efe22afe42c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out) [pid 372] futex(0x7efe22afe43c, FUTEX_WAKE_PRIVATE, 1000000) = 0 [pid 372] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7efe229e7000 [pid 372] mprotect(0x7efe229e8000, 131072, PROT_READ|PROT_WRITE) = 0 [pid 372] clone(child_stack=0x7efe22a073f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 376 attached , parent_tid=[376], tls=0x7efe22a07700, child_tidptr=0x7efe22a079d0) = 376 [pid 376] set_robust_list(0x7efe22a079e0, 24) = 0 [pid 376] futex(0x7efe22afe438, FUTEX_WAIT_PRIVATE, 0, NULL [pid 372] futex(0x7efe22afe438, FUTEX_WAKE_PRIVATE, 1000000) = 1 [pid 372] futex(0x7efe22afe43c, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} [pid 376] <... futex resumed>) = 0 [ 18.733171][ T23] audit: type=1400 audit(1655516443.240:73): avc: denied { execmem } for pid=371 comm="syz-executor956" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 18.744894][ T23] audit: type=1400 audit(1655516443.250:74): avc: denied { create } for pid=372 comm="syz-executor956" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=packet_socket permissive=1 [ 18.748063][ T23] audit: type=1400 audit(1655516443.250:75): avc: denied { read } for pid=198 comm="dhcpcd" scontext=system_u:system_r:dhcpc_t tcontext=system_u:system_r:dhcpc_t tclass=netlink_kobject_uevent_socket permissive=1 [ 18.751571][ T23] audit: type=1400 audit(1655516443.250:76): avc: denied { ioctl } for pid=372 comm="syz-executor956" path="socket:[1504]" dev="sockfs" ino=1504 ioctlcmd=0x8933 scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=packet_socket permissive=1 [ 18.752093][ T373] netlink: 20 bytes leftover after parsing attributes in process `syz-executor956'. [ 18.804381][ T376] ------------[ cut here ]------------ [ 18.809888][ T376] WARNING: CPU: 0 PID: 376 at net/core/dev.c:6742 netif_napi_add+0x8f2/0xa20 [ 18.818772][ T376] Modules linked in: [ 18.822781][ T376] CPU: 0 PID: 376 Comm: syz-executor956 Not tainted 5.10.117-syzkaller-00814-gfdd06dc6b0f8 #0 [ 18.833147][ T376] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.843325][ T376] RIP: 0010:netif_napi_add+0x8f2/0xa20 [pid 376] ioctl(3, TUNSETIFF, 0x20000200 [pid 372] <... futex resumed>) = -1 ETIMEDOUT (Connection timed out) [ 18.848757][ T376] Code: c2 e0 25 79 85 48 c7 c1 90 f0 c1 85 45 89 e8 31 c0 e8 66 97 cc 00 e9 12 fc ff ff e8 b8 d7 a8 fd e9 d5 fe ff ff e8 ae d7 a8 fd <0f> 0b eb a0 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 2e f8 ff ff e8 75 [ 18.868397][ T376] RSP: 0018:ffffc9000036faf0 EFLAGS: 00010293 [ 18.874495][ T376] RAX: ffffffff83c3daa2 RBX: ffff88811c6e6000 RCX: ffff8881065a2780 [ 18.882478][ T376] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 18.890432][ T376] RBP: ffffc9000036fb40 R08: ffffffff83c3d1fc R09: ffffed10238dcc86 [ 18.898405][ T376] R10: ffffed10238dcc86 R11: 1ffff110238dcc85 R12: ffff88811c6e6428 [ 18.906378][ T376] R13: 0000000000000040 R14: ffff88811c6e6418 R15: ffffffff82eee9a0 [ 18.914362][ T376] FS: 00007efe22a07700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 18.923290][ T376] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 18.929852][ T376] CR2: 000055a446bb1af8 CR3: 000000011d616000 CR4: 00000000003506a0 [ 18.937832][ T376] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 18.945801][ T376] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [pid 372] exit_group(0) = ? [ 18.953773][ T376] Call Trace: [ 18.957052][ T376] ? xdp_rxq_info_reg+0x194/0x2f0 [ 18.962174][ T376] tun_attach+0x877/0x14c0 [ 18.966597][ T376] tun_set_iff+0xadf/0x1100 [ 18.971073][ T376] __tun_chr_ioctl+0x8ab/0x2130 [ 18.976027][ T376] ? tun_flow_create+0x320/0x320 [ 18.980957][ T376] ? __fget_files+0x310/0x370 [ 18.985639][ T376] tun_chr_ioctl+0x2a/0x40 [ 18.990041][ T376] ? tun_chr_poll+0x650/0x650 [ 18.994708][ T376] __se_sys_ioctl+0x115/0x190 [ 18.999374][ T376] __x64_sys_ioctl+0x7b/0x90 [ 19.003960][ T376] do_syscall_64+0x34/0x70 [ 19.008381][ T376] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 19.014291][ T376] RIP: 0033:0x7efe22a76a69 [ 19.018693][ T376] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 [ 19.038314][ T376] RSP: 002b:00007efe22a07308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 19.046746][ T376] RAX: ffffffffffffffda RBX: 00007efe22afe438 RCX: 00007efe22a76a69 [ 19.054712][ T376] RDX: 0000000020000200 RSI: 00000000400454ca RDI: 0000000000000003 [ 19.062682][ T376] RBP: 00007efe22afe430 R08: 0000000000000000 R09: 0000000000000000 [ 19.070626][ T376] R10: 00007efe22a07700 R11: 0000000000000246 R12: 00007efe22afe43c [ 19.078596][ T376] R13: 00007efe22acc064 R14: 74656e2f7665642f R15: 0000000000022000 [ 19.086561][ T376] ---[ end trace ee2f0ec090eac728 ]--- [ 19.092112][ T376] ------------[ cut here ]------------ [ 19.097560][ T376] kernel BUG at include/linux/netdevice.h:518! [ 19.103717][ T376] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 19.109868][ T376] CPU: 1 PID: 376 Comm: syz-executor956 Tainted: G W 5.10.117-syzkaller-00814-gfdd06dc6b0f8 #0 [ 19.121464][ T376] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.131498][ T376] RIP: 0010:tun_attach+0x14b3/0x14c0 [ 19.136753][ T376] Code: 89 df e8 e0 ba b7 fe e9 cf fa ff ff e8 f6 e4 7d fe 48 c7 c7 a0 12 68 86 48 89 de e8 67 7c 7b ff e9 e0 fb ff ff e8 dd e4 7d fe <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 [ 19.156335][ T376] RSP: 0018:ffffc9000036fb50 EFLAGS: 00010293 [ 19.162378][ T376] RAX: ffffffff82eecd73 RBX: 0000000000000000 RCX: ffff8881065a2780 [ 19.170325][ T376] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 19.178272][ T376] RBP: ffffc9000036fc70 R08: ffffffff82eec175 R09: ffffed10238dcc86 [ 19.186222][ T376] R10: ffffed10238dcc86 R11: 1ffff110238dcc85 R12: ffff88811c6e6428 [ 19.194187][ T376] R13: ffff888106398980 R14: ffff888106398000 R15: dffffc0000000000 [ 19.202134][ T376] FS: 00007efe22a07700(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 19.211036][ T376] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.217593][ T376] CR2: 000055a446bb1af8 CR3: 000000011d616000 CR4: 00000000003506a0 [ 19.225546][ T376] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.233503][ T376] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.241445][ T376] Call Trace: [ 19.244717][ T376] tun_set_iff+0xadf/0x1100 [ 19.249198][ T376] __tun_chr_ioctl+0x8ab/0x2130 [ 19.254022][ T376] ? tun_flow_create+0x320/0x320 [ 19.258936][ T376] ? __fget_files+0x310/0x370 [ 19.263590][ T376] tun_chr_ioctl+0x2a/0x40 [ 19.267978][ T376] ? tun_chr_poll+0x650/0x650 [ 19.272628][ T376] __se_sys_ioctl+0x115/0x190 [ 19.277279][ T376] __x64_sys_ioctl+0x7b/0x90 [ 19.281867][ T376] do_syscall_64+0x34/0x70 [ 19.286260][ T376] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 19.292127][ T376] RIP: 0033:0x7efe22a76a69 [ 19.296535][ T376] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 [ 19.316199][ T376] RSP: 002b:00007efe22a07308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 19.324612][ T376] RAX: ffffffffffffffda RBX: 00007efe22afe438 RCX: 00007efe22a76a69 [ 19.332561][ T376] RDX: 0000000020000200 RSI: 00000000400454ca RDI: 0000000000000003 [ 19.340507][ T376] RBP: 00007efe22afe430 R08: 0000000000000000 R09: 0000000000000000 [ 19.348452][ T376] R10: 00007efe22a07700 R11: 0000000000000246 R12: 00007efe22afe43c [ 19.356400][ T376] R13: 00007efe22acc064 R14: 74656e2f7665642f R15: 0000000000022000 [ 19.364346][ T376] Modules linked in: [ 19.368319][ T376] ---[ end trace ee2f0ec090eac729 ]--- [ 19.373845][ T376] RIP: 0010:tun_attach+0x14b3/0x14c0 [ 19.379195][ T376] Code: 89 df e8 e0 ba b7 fe e9 cf fa ff ff e8 f6 e4 7d fe 48 c7 c7 a0 12 68 86 48 89 de e8 67 7c 7b ff e9 e0 fb ff ff e8 dd e4 7d fe <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 [ 19.398803][ T376] RSP: 0018:ffffc9000036fb50 EFLAGS: 00010293 [ 19.404871][ T376] RAX: ffffffff82eecd73 RBX: 0000000000000000 RCX: ffff8881065a2780 [ 19.412835][ T376] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 19.420782][ T376] RBP: ffffc9000036fc70 R08: ffffffff82eec175 R09: ffffed10238dcc86 [ 19.428764][ T376] R10: ffffed10238dcc86 R11: 1ffff110238dcc85 R12: ffff88811c6e6428 [ 19.436731][ T376] R13: ffff888106398980 R14: ffff888106398000 R15: dffffc0000000000 [ 19.444707][ T376] FS: 00007efe22a07700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 [ 19.453656][ T376] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.460229][ T376] CR2: 00007efe22acbc88 CR3: 000000011d616000 CR4: 00000000003506b0 [ 19.468229][ T376] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.476195][ T376] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.484179][ T376] Kernel panic - not syncing: Fatal exception [ 19.490421][ T376] Kernel Offset: disabled [ 19.494736][ T376] Rebooting in 86400 seconds..