./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor647419185 <...> Warning: Permanently added '10.128.1.123' (ED25519) to the list of known hosts. execve("./syz-executor647419185", ["./syz-executor647419185"], 0x7ffe6386e840 /* 10 vars */) = 0 brk(NULL) = 0x555556429000 brk(0x555556429d00) = 0x555556429d00 arch_prctl(ARCH_SET_FS, 0x555556429380) = 0 set_tid_address(0x555556429650) = 5060 set_robust_list(0x555556429660, 24) = 0 rseq(0x555556429ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor647419185", 4096) = 27 getrandom("\x94\x0b\xd3\x36\x8d\xb7\x4b\x1a", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555556429d00 brk(0x55555644ad00) = 0x55555644ad00 brk(0x55555644b000) = 0x55555644b000 mprotect(0x7fc43e53e000, 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 unshare(CLONE_NEWPID) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555556429650) = 5061 ./strace-static-x86_64: Process 5061 attached [pid 5061] set_robust_list(0x555556429660, 24) = 0 [pid 5061] mount(NULL, "/sys/fs/fuse/connections", "fusectl", 0, NULL) = -1 EBUSY (Device or resource busy) [pid 5061] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5061] setsid() = 1 [pid 5061] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0 [pid 5061] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0 [pid 5061] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0 [pid 5061] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0 [pid 5061] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0 [pid 5061] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0 [pid 5061] unshare(CLONE_NEWNS) = 0 [pid 5061] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0 [pid 5061] unshare(CLONE_NEWIPC) = 0 [pid 5061] unshare(CLONE_NEWCGROUP) = 0 [pid 5061] unshare(CLONE_NEWUTS) = 0 [pid 5061] unshare(CLONE_SYSVSEM) = 0 [pid 5061] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5061] write(3, "16777216", 8) = 8 [pid 5061] close(3) = 0 [pid 5061] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3 [pid 5061] write(3, "536870912", 9) = 9 [pid 5061] close(3) = 0 [pid 5061] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5061] write(3, "1024", 4) = 4 [pid 5061] close(3) = 0 [pid 5061] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5061] write(3, "8192", 4) = 4 [pid 5061] close(3) = 0 [pid 5061] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5061] write(3, "1024", 4) = 4 [pid 5061] close(3) = 0 [pid 5061] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3 [pid 5061] write(3, "1024", 4) = 4 [pid 5061] close(3) = 0 [pid 5061] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3 [pid 5061] write(3, "1024 1048576 500 1024", 21) = 21 [pid 5061] close(3) = 0 [pid 5061] getpid() = 1 [pid 5061] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1< 12]) = 0 [ 63.719589][ T5061] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 63.727425][ T5061] #PF: supervisor instruction fetch in kernel mode [ 63.733914][ T5061] #PF: error_code(0x0010) - not-present page [ 63.739873][ T5061] PGD 207a7067 P4D 207a7067 PUD 2c973067 PMD 0 [ 63.746118][ T5061] Oops: 0010 [#1] PREEMPT SMP KASAN [ 63.751303][ T5061] CPU: 1 PID: 5061 Comm: syz-executor647 Not tainted 6.7.0-rc8-next-20240105-syzkaller #0 [ 63.761171][ T5061] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 [ 63.771209][ T5061] RIP: 0010:0x0 [ 63.774668][ T5061] Code: Unable to access opcode bytes at 0xffffffffffffffd6. [ 63.782022][ T5061] RSP: 0018:ffffc90003a6f408 EFLAGS: 00010246 [ 63.788072][ T5061] RAX: dffffc0000000000 RBX: ffff8880231e2000 RCX: ffffffff889a5187 [ 63.796023][ T5061] RDX: 0000000000000000 RSI: 000000000000fff2 RDI: ffff8880231e2000 [ 63.803975][ T5061] RBP: ffffffff8f3b9260 R08: 0000000000000001 R09: 0000000000000000 [ 63.811932][ T5061] R10: 0000000000000001 R11: 00000000598393a6 R12: ffff88802e61a000 [ 63.819885][ T5061] R13: ffffffff8beef640 R14: 0000000000000001 R15: ffffffff8f3b9260 [ 63.827839][ T5061] FS: 0000555556429380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 [ 63.836753][ T5061] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.843323][ T5061] CR2: ffffffffffffffd6 CR3: 0000000020a12000 CR4: 00000000003506f0 [ 63.851284][ T5061] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 63.859239][ T5061] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 63.867214][ T5061] Call Trace: [ 63.870476][ T5061] [ 63.873392][ T5061] ? show_regs+0x8e/0xa0 [ 63.877642][ T5061] ? __die+0x2c/0x80 [ 63.881530][ T5061] ? page_fault_oops+0x397/0xab0 [ 63.886450][ T5061] ? dump_pagetable+0x530/0x530 [ 63.891286][ T5061] ? netem_change+0x1505/0x2520 [ 63.896150][ T5061] ? netem_dump+0x1260/0x1260 [ 63.900808][ T5061] ? do_user_addr_fault+0x562/0x1020 [ 63.906076][ T5061] ? rcu_is_watching+0x12/0xb0 [ 63.910825][ T5061] ? exc_page_fault+0x5c/0xc0 [ 63.915484][ T5061] ? asm_exc_page_fault+0x26/0x30 [ 63.920491][ T5061] ? qdisc_create+0xca7/0x1440 [ 63.925243][ T5061] qdisc_create+0x6c0/0x1440 [ 63.929821][ T5061] ? tc_get_qdisc+0xdf0/0xdf0 [ 63.934486][ T5061] ? __nla_parse+0x40/0x50 [ 63.938890][ T5061] tc_modify_qdisc+0x4d5/0x1c30 [ 63.943729][ T5061] ? qdisc_create+0x1440/0x1440 [ 63.948564][ T5061] ? trace_irq_enable.constprop.0+0xe0/0x110 [ 63.954537][ T5061] ? bpf_lsm_capable+0x9/0x10 [ 63.959192][ T5061] ? security_capable+0x92/0xc0 [ 63.964028][ T5061] ? qdisc_create+0x1440/0x1440 [ 63.968862][ T5061] rtnetlink_rcv_msg+0x3c7/0xe00 [ 63.973785][ T5061] ? rtnl_fill_vf+0x490/0x490 [ 63.978445][ T5061] netlink_rcv_skb+0x16b/0x440 [ 63.983193][ T5061] ? rtnl_fill_vf+0x490/0x490 [ 63.987851][ T5061] ? netlink_ack+0x1380/0x1380 [ 63.992611][ T5061] ? lock_sync+0x190/0x190 [ 63.997024][ T5061] ? __rhashtable_lookup.constprop.0+0x397/0x710 [ 64.003351][ T5061] ? netlink_deliver_tap+0x1a0/0xd00 [ 64.008620][ T5061] ? _copy_from_iter+0x2c1/0x10f0 [ 64.013633][ T5061] netlink_unicast+0x53b/0x810 [ 64.018388][ T5061] ? netlink_attachskb+0x870/0x870 [ 64.023508][ T5061] ? __phys_addr_symbol+0x30/0x70 [ 64.028520][ T5061] ? __check_object_size+0x322/0x730 [ 64.033801][ T5061] netlink_sendmsg+0x8b4/0xd70 [ 64.038554][ T5061] ? netlink_unicast+0x810/0x810 [ 64.043477][ T5061] ? bpf_lsm_socket_sendmsg+0x9/0x10 [ 64.048751][ T5061] ? netlink_unicast+0x810/0x810 [ 64.053674][ T5061] __sock_sendmsg+0xd5/0x180 [ 64.058255][ T5061] ____sys_sendmsg+0x6ac/0x940 [ 64.063008][ T5061] ? copy_msghdr_from_user+0x10b/0x160 [ 64.068449][ T5061] ? kernel_sendmsg+0x50/0x50 [ 64.073118][ T5061] ? finish_task_switch.isra.0+0x217/0xcb0 [ 64.078913][ T5061] ? __switch_to+0x749/0x1370 [ 64.083578][ T5061] ___sys_sendmsg+0x135/0x1d0 [ 64.088237][ T5061] ? do_recvmmsg+0x740/0x740 [ 64.092812][ T5061] ? lock_sync+0x190/0x190 [ 64.097205][ T5061] ? ptrace_stop.part.0+0x44a/0x930 [ 64.102389][ T5061] ? __fget_light+0x172/0x200 [ 64.107050][ T5061] __sys_sendmsg+0x117/0x1e0 [ 64.111622][ T5061] ? __sys_sendmsg_sock+0x30/0x30 [ 64.116628][ T5061] ? ptrace_notify+0xf1/0x130 [ 64.121290][ T5061] ? _raw_spin_unlock_irq+0x2e/0x50 [ 64.126472][ T5061] ? ptrace_notify+0xf1/0x130 [ 64.131130][ T5061] do_syscall_64+0xd0/0x250 [ 64.135620][ T5061] entry_SYSCALL_64_after_hwframe+0x62/0x6a [ 64.141496][ T5061] RIP: 0033:0x7fc43e4cb879 [ 64.145889][ T5061] Code: 48 83 c4 28 c3 e8 27 18 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 [ 64.165476][ T5061] RSP: 002b:00007ffd16b6f1b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 64.173869][ T5061] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc43e4cb879 [ 64.181850][ T5061] RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000003 [ 64.189815][ T5061] RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd16b6f230 [ 64.197774][ T5061] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 64.205726][ T5061] R13: 00007ffd16b6f3b8 R14: 0000000000000001 R15: 0000000000000001 [ 64.213686][ T5061] [ 64.216688][ T5061] Modules linked in: [ 64.220564][ T5061] CR2: 0000000000000000 [ 64.224699][ T5061] ---[ end trace 0000000000000000 ]--- [ 64.230152][ T5061] RIP: 0010:0x0 [ 64.233598][ T5061] Code: Unable to access opcode bytes at 0xffffffffffffffd6. [ 64.240939][ T5061] RSP: 0018:ffffc90003a6f408 EFLAGS: 00010246 [ 64.246996][ T5061] RAX: dffffc0000000000 RBX: ffff8880231e2000 RCX: ffffffff889a5187 [ 64.254960][ T5061] RDX: 0000000000000000 RSI: 000000000000fff2 RDI: ffff8880231e2000 [ 64.262915][ T5061] RBP: ffffffff8f3b9260 R08: 0000000000000001 R09: 0000000000000000 [ 64.270871][ T5061] R10: 0000000000000001 R11: 00000000598393a6 R12: ffff88802e61a000 [ 64.278826][ T5061] R13: ffffffff8beef640 R14: 0000000000000001 R15: ffffffff8f3b9260 [ 64.286782][ T5061] FS: 0000555556429380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 [ 64.295695][ T5061] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 64.302284][ T5061] CR2: ffffffffffffffd6 CR3: 0000000020a12000 CR4: 00000000003506f0 [ 64.310241][ T5061] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 64.318194][ T5061] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 64.326151][ T5061] Kernel panic - not syncing: Fatal exception [ 64.332420][ T5061] Kernel Offset: disabled [ 64.336728][ T5061] Rebooting in 86400 seconds..