./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor548131889 <...> Warning: Permanently added '10.128.0.98' (ECDSA) to the list of known hosts. execve("./syz-executor548131889", ["./syz-executor548131889"], 0x7ffe77bc32e0 /* 10 vars */) = 0 brk(NULL) = 0x555555d6c000 brk(0x555555d6cc40) = 0x555555d6cc40 arch_prctl(ARCH_SET_FS, 0x555555d6c300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor548131889", 4096) = 27 brk(0x555555d8dc40) = 0x555555d8dc40 brk(0x555555d8e000) = 0x555555d8e000 mprotect(0x7f36139d7000, 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./strace-static-x86_64: Process 5082 attached , child_tidptr=0x555555d6c5d0) = 5082 [pid 5082] mount(NULL, "/sys/fs/fuse/connections", "fusectl", 0, NULL) = -1 EBUSY (Device or resource busy) [pid 5082] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5082] setsid() = 1 [pid 5082] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0 [pid 5082] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0 [pid 5082] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0 [pid 5082] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0 [pid 5082] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0 [pid 5082] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0 [pid 5082] unshare(CLONE_NEWNS) = 0 [pid 5082] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0 [pid 5082] unshare(CLONE_NEWIPC) = 0 [pid 5082] unshare(CLONE_NEWCGROUP) = 0 [pid 5082] unshare(CLONE_NEWUTS) = 0 [pid 5082] unshare(CLONE_SYSVSEM) = 0 [pid 5082] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5082] write(3, "16777216", 8) = 8 [pid 5082] close(3) = 0 [pid 5082] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3 [pid 5082] write(3, "536870912", 9) = 9 [pid 5082] close(3) = 0 [pid 5082] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5082] write(3, "1024", 4) = 4 [pid 5082] close(3) = 0 [pid 5082] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5082] write(3, "8192", 4) = 4 [pid 5082] close(3) = 0 [pid 5082] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5082] write(3, "1024", 4) = 4 [pid 5082] close(3) = 0 [pid 5082] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3 [pid 5082] write(3, "1024", 4) = 4 [pid 5082] close(3) = 0 [pid 5082] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3 [pid 5082] write(3, "1024 1048576 500 1024", 21) = 21 [pid 5082] close(3) = 0 [pid 5082] getpid() = 1 [pid 5082] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1< 12]) = 0 [pid 5082] sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\x38\x00\x00\x00\x24\x00\x07\x1f\xa6\x6d\xd6\xb6\xcd\x7f\x46\x37\x05\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff\x00\x00\x00\x00\x09\x00\x01\x00\x68\x66\x73\x63\x00\x00\x00\x00\x08\x00\x02\x00\x00\x00\x00\x00", iov_len=56}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = -1 EBADF (Bad file descriptor) [pid 5082] sendmsg(-1, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\x3c\x00\x00\x00\x2c\x00\x27\x0d\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x08\x00\x00\x00\x0b\x00\x01\x00\x66\x6c\x6f\x77\x65\x72\x00\x00\x0c\x00\x02\x00\x08\x00\x16\x00\x18\x00\x00\x00", iov_len=60}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = -1 EBADF (Bad file descriptor) [pid 5082] socket(AF_NETLINK, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 4 syzkaller login: [ 83.230435][ T5082] ================================================================== [ 83.238543][ T5082] BUG: KASAN: null-ptr-deref in __fl_put+0x13e/0x3b0 [ 83.245273][ T5082] Read of size 4 at addr 000000000000014c by task syz-executor548/5082 [ 83.253517][ T5082] [ 83.255839][ T5082] CPU: 0 PID: 5082 Comm: syz-executor548 Not tainted 6.2.0-syzkaller-05251-g5b7c4cabbb65 #0 [ 83.265918][ T5082] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 [ 83.275997][ T5082] Call Trace: [ 83.279298][ T5082] [ 83.282245][ T5082] dump_stack_lvl+0xd9/0x150 [ 83.286867][ T5082] ? __fl_put+0x13e/0x3b0 [ 83.291232][ T5082] kasan_report+0xec/0x130 [ 83.295694][ T5082] ? __fl_put+0x13e/0x3b0 [ 83.300102][ T5082] kasan_check_range+0x141/0x190 [ 83.305086][ T5082] __fl_put+0x13e/0x3b0 [ 83.309288][ T5082] ? fl_classify+0x6d0/0x6d0 [ 83.313921][ T5082] fl_change+0x101b/0x4ab0 [ 83.318386][ T5082] ? find_held_lock+0x2d/0x110 [ 83.323204][ T5082] ? fl_destroy+0x320/0x320 [ 83.327838][ T5082] ? __radix_tree_lookup+0x215/0x2a0 [ 83.333259][ T5082] ? fl_get+0x229/0x3c0 [ 83.337467][ T5082] ? fl_put+0x20/0x20 [ 83.341583][ T5082] tc_new_tfilter+0x97c/0x2290 [ 83.346390][ T5082] ? tc_del_tfilter+0x15d0/0x15d0 [ 83.351470][ T5082] ? mark_lock.part.0+0xee/0x1970 [ 83.356520][ T5082] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 83.362527][ T5082] ? mark_lock.part.0+0xee/0x1970 [ 83.367591][ T5082] ? print_usage_bug.part.0+0x660/0x660 [ 83.373181][ T5082] ? rtnetlink_rcv_msg+0x956/0xd50 [ 83.378348][ T5082] ? lock_downgrade+0x690/0x690 [ 83.383239][ T5082] ? tc_del_tfilter+0x15d0/0x15d0 [ 83.388292][ T5082] rtnetlink_rcv_msg+0x996/0xd50 [ 83.393268][ T5082] ? rtnl_stats_set+0x4d0/0x4d0 [ 83.398152][ T5082] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 83.404243][ T5082] ? __sys_sendmmsg+0x18f/0x460 [ 83.409138][ T5082] ? __x64_sys_sendmmsg+0x9d/0x100 [ 83.414307][ T5082] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 83.420331][ T5082] netlink_rcv_skb+0x165/0x440 [ 83.425411][ T5082] ? rtnl_stats_set+0x4d0/0x4d0 [ 83.430319][ T5082] ? netlink_ack+0x1360/0x1360 [ 83.435241][ T5082] ? netlink_deliver_tap+0x1b1/0xcf0 [ 83.440621][ T5082] netlink_unicast+0x547/0x7f0 [ 83.445449][ T5082] ? netlink_attachskb+0x890/0x890 [ 83.451818][ T5082] ? __virt_addr_valid+0x61/0x2e0 [ 83.456912][ T5082] ? __phys_addr_symbol+0x30/0x70 [ 83.461986][ T5082] ? __check_object_size+0x333/0x6e0 [ 83.467313][ T5082] netlink_sendmsg+0x925/0xe30 [ 83.472119][ T5082] ? netlink_unicast+0x7f0/0x7f0 [ 83.477108][ T5082] ? bpf_lsm_socket_sendmsg+0x9/0x10 [ 83.482490][ T5082] ? netlink_unicast+0x7f0/0x7f0 [ 83.487481][ T5082] sock_sendmsg+0xde/0x190 [ 83.491968][ T5082] ____sys_sendmsg+0x334/0x900 [ 83.496766][ T5082] ? copy_msghdr_from_user+0xfc/0x150 [ 83.502265][ T5082] ? kernel_sendmsg+0x50/0x50 [ 83.506979][ T5082] ___sys_sendmsg+0x110/0x1b0 [ 83.511703][ T5082] ? do_recvmmsg+0x6e0/0x6e0 [ 83.516335][ T5082] ? find_held_lock+0x2d/0x110 [ 83.521140][ T5082] ? __might_fault+0xd9/0x180 [ 83.525838][ T5082] ? lock_downgrade+0x690/0x690 [ 83.530730][ T5082] __sys_sendmmsg+0x18f/0x460 [ 83.535460][ T5082] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 83.540531][ T5082] ? find_held_lock+0x2d/0x110 [ 83.545351][ T5082] ? ptrace_notify+0xfe/0x140 [ 83.550068][ T5082] ? _raw_spin_unlock_irq+0x23/0x50 [ 83.555304][ T5082] ? lockdep_hardirqs_on+0x7d/0x100 [ 83.560541][ T5082] __x64_sys_sendmmsg+0x9d/0x100 [ 83.565628][ T5082] do_syscall_64+0x39/0xb0 [ 83.570091][ T5082] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 83.576026][ T5082] RIP: 0033:0x7f3613969d19 [ 83.580460][ T5082] Code: 28 c3 e8 1a 15 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48 [ 83.600174][ T5082] RSP: 002b:00007ffc884e0c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 83.608643][ T5082] RAX: ffffffffffffffda RBX: 00007f36139d7ed0 RCX: 00007f3613969d19 [ 83.616639][ T5082] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 83.624635][ T5082] RBP: 00007ffc884e0c98 R08: 00007f36139d7e40 R09: 00007f36139d7e40 [ 83.632807][ T5082] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc884e0ca0 [ 83.640797][ T5082] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 83.648796][ T5082] [ 83.651826][ T5082] ================================================================== [ 83.660180][ T5082] Kernel panic - not syncing: KASAN: panic_on_warn set ... [ 83.667402][ T5082] CPU: 0 PID: 5082 Comm: syz-executor548 Not tainted 6.2.0-syzkaller-05251-g5b7c4cabbb65 #0 [ 83.677609][ T5082] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 [ 83.687702][ T5082] Call Trace: [ 83.690992][ T5082] [ 83.693935][ T5082] dump_stack_lvl+0xd9/0x150 [ 83.698568][ T5082] panic+0x61b/0x6c0 [ 83.702489][ T5082] ? panic_smp_self_stop+0x90/0x90 [ 83.707628][ T5082] ? preempt_schedule_thunk+0x1a/0x20 [ 83.713039][ T5082] ? preempt_schedule_common+0x45/0xb0 [ 83.718541][ T5082] check_panic_on_warn+0xb1/0xc0 [ 83.723610][ T5082] end_report+0xf6/0x180 [ 83.727909][ T5082] ? __fl_put+0x13e/0x3b0 [ 83.732292][ T5082] kasan_report+0xf9/0x130 [ 83.736753][ T5082] ? __fl_put+0x13e/0x3b0 [ 83.741151][ T5082] kasan_check_range+0x141/0x190 [ 83.746119][ T5082] __fl_put+0x13e/0x3b0 [ 83.750318][ T5082] ? fl_classify+0x6d0/0x6d0 [ 83.754955][ T5082] fl_change+0x101b/0x4ab0 [ 83.759506][ T5082] ? find_held_lock+0x2d/0x110 [ 83.764320][ T5082] ? fl_destroy+0x320/0x320 [ 83.768870][ T5082] ? __radix_tree_lookup+0x215/0x2a0 [ 83.774360][ T5082] ? fl_get+0x229/0x3c0 [ 83.778550][ T5082] ? fl_put+0x20/0x20 [ 83.782570][ T5082] tc_new_tfilter+0x97c/0x2290 [ 83.787559][ T5082] ? tc_del_tfilter+0x15d0/0x15d0 [ 83.792608][ T5082] ? mark_lock.part.0+0xee/0x1970 [ 83.797675][ T5082] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 83.803702][ T5082] ? mark_lock.part.0+0xee/0x1970 [ 83.808752][ T5082] ? print_usage_bug.part.0+0x660/0x660 [ 83.814361][ T5082] ? rtnetlink_rcv_msg+0x956/0xd50 [ 83.819515][ T5082] ? lock_downgrade+0x690/0x690 [ 83.824412][ T5082] ? tc_del_tfilter+0x15d0/0x15d0 [ 83.829460][ T5082] rtnetlink_rcv_msg+0x996/0xd50 [ 83.834440][ T5082] ? rtnl_stats_set+0x4d0/0x4d0 [ 83.839324][ T5082] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 83.845335][ T5082] ? __sys_sendmmsg+0x18f/0x460 [ 83.850231][ T5082] ? __x64_sys_sendmmsg+0x9d/0x100 [ 83.855382][ T5082] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 83.861403][ T5082] netlink_rcv_skb+0x165/0x440 [ 83.866204][ T5082] ? rtnl_stats_set+0x4d0/0x4d0 [ 83.871092][ T5082] ? netlink_ack+0x1360/0x1360 [ 83.875900][ T5082] ? netlink_deliver_tap+0x1b1/0xcf0 [ 83.881220][ T5082] netlink_unicast+0x547/0x7f0 [ 83.886044][ T5082] ? netlink_attachskb+0x890/0x890 [ 83.891186][ T5082] ? __virt_addr_valid+0x61/0x2e0 [ 83.896355][ T5082] ? __phys_addr_symbol+0x30/0x70 [ 83.901416][ T5082] ? __check_object_size+0x333/0x6e0 [ 83.906732][ T5082] netlink_sendmsg+0x925/0xe30 [ 83.911813][ T5082] ? netlink_unicast+0x7f0/0x7f0 [ 83.916798][ T5082] ? bpf_lsm_socket_sendmsg+0x9/0x10 [ 83.922131][ T5082] ? netlink_unicast+0x7f0/0x7f0 [ 83.927118][ T5082] sock_sendmsg+0xde/0x190 [ 83.931589][ T5082] ____sys_sendmsg+0x334/0x900 [ 83.936397][ T5082] ? copy_msghdr_from_user+0xfc/0x150 [ 83.941836][ T5082] ? kernel_sendmsg+0x50/0x50 [ 83.946567][ T5082] ___sys_sendmsg+0x110/0x1b0 [ 83.951380][ T5082] ? do_recvmmsg+0x6e0/0x6e0 [ 83.956025][ T5082] ? find_held_lock+0x2d/0x110 [ 83.960830][ T5082] ? __might_fault+0xd9/0x180 [ 83.965536][ T5082] ? lock_downgrade+0x690/0x690 [ 83.970422][ T5082] __sys_sendmmsg+0x18f/0x460 [ 83.975148][ T5082] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 83.980221][ T5082] ? find_held_lock+0x2d/0x110 [ 83.985030][ T5082] ? ptrace_notify+0xfe/0x140 [ 83.989736][ T5082] ? _raw_spin_unlock_irq+0x23/0x50 [ 83.995143][ T5082] ? lockdep_hardirqs_on+0x7d/0x100 [ 84.000369][ T5082] __x64_sys_sendmmsg+0x9d/0x100 [ 84.005351][ T5082] do_syscall_64+0x39/0xb0 [ 84.009803][ T5082] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 84.015747][ T5082] RIP: 0033:0x7f3613969d19 [ 84.020193][ T5082] Code: 28 c3 e8 1a 15 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48 [ 84.039909][ T5082] RSP: 002b:00007ffc884e0c88 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 84.048344][ T5082] RAX: ffffffffffffffda RBX: 00007f36139d7ed0 RCX: 00007f3613969d19 [ 84.056333][ T5082] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 84.064321][ T5082] RBP: 00007ffc884e0c98 R08: 00007f36139d7e40 R09: 00007f36139d7e40 [ 84.072313][ T5082] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc884e0ca0 [ 84.080312][ T5082] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 84.088310][ T5082] [ 84.091517][ T5082] Kernel Offset: disabled [ 84.095855][ T5082] Rebooting in 86400 seconds..