./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2478550834 <...> Warning: Permanently added '10.128.1.113' (ED25519) to the list of known hosts. execve("./syz-executor2478550834", ["./syz-executor2478550834"], 0x7ffeddaf7a00 /* 10 vars */) = 0 brk(NULL) = 0x555575859000 brk(0x555575859d00) = 0x555575859d00 arch_prctl(ARCH_SET_FS, 0x555575859380) = 0 set_tid_address(0x555575859650) = 5836 set_robust_list(0x555575859660, 24) = 0 rseq(0x555575859ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor2478550834", 4096) = 28 getrandom("\x2a\x1c\x80\xe8\x0b\x22\xc0\x2e", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555575859d00 brk(0x55557587ad00) = 0x55557587ad00 brk(0x55557587b000) = 0x55557587b000 mprotect(0x7efc533b5000, 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=0x555575859650) = 5837 ./strace-static-x86_64: Process 5837 attached [pid 5837] set_robust_list(0x555575859660, 24) = 0 [pid 5837] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5837] getppid() = 0 [pid 5837] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0 [pid 5837] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0 [pid 5837] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0 [pid 5837] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0 [pid 5837] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0 [pid 5837] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0 [pid 5837] unshare(CLONE_NEWNS) = 0 [pid 5837] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0 [pid 5837] unshare(CLONE_NEWIPC) = 0 [pid 5837] unshare(CLONE_NEWCGROUP) = 0 [pid 5837] unshare(CLONE_NEWUTS) = 0 [pid 5837] unshare(CLONE_SYSVSEM) = 0 [pid 5837] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5837] write(3, "16777216", 8) = 8 [pid 5837] close(3) = 0 [pid 5837] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3 [pid 5837] write(3, "536870912", 9) = 9 [pid 5837] close(3) = 0 [pid 5837] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5837] write(3, "1024", 4) = 4 [pid 5837] close(3) = 0 [pid 5837] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5837] write(3, "8192", 4) = 4 [pid 5837] close(3) = 0 [pid 5837] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5837] write(3, "1024", 4) = 4 [pid 5837] close(3) = 0 [pid 5837] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3 [pid 5837] write(3, "1024", 4) = 4 [pid 5837] close(3) = 0 [pid 5837] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3 [pid 5837] write(3, "1024 1048576 500 1024", 21) = 21 [pid 5837] close(3) = 0 [pid 5837] getpid() = 1 [pid 5837] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1< [pid 5847] set_robust_list(0x555575859660, 24 [pid 5837] <... clone resumed>, child_tidptr=0x555575859650) = 2 [pid 5847] <... set_robust_list resumed>) = 0 [pid 5847] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5847] setpgid(0, 0) = 0 [pid 5847] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5847] write(3, "1000", 4) = 4 [pid 5847] close(3) = 0 [pid 5847] write(1, "executing program\n", 18executing program ) = 18 [pid 5847] socket(AF_CAN, SOCK_DGRAM, CAN_J1939) = 3 [pid 5847] socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE) = 4 [pid 5847] ioctl(4, SIOCGIFINDEX, {ifr_name="vxcan1", ifr_ifindex=21}) = 0 [pid 5847] bind(3, {sa_family=AF_CAN, sa_data="\x00\x00\x15\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, 24) = 0 [pid 5847] sendmsg(3, {msg_name={sa_family=AF_CAN, sa_data="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, msg_namelen=24, msg_iov=[{iov_base="\x63\xe2\x50\x87\x69\x33\x87\x4d\xf4\x4e\x1b\x77\xa3\x1e\xc3\xdb\x50\xad\xb6\x78\xb3\x92\x70\x58\x42\x6e\x7f\xf8\xea\xbe\x59\x64\xf7\x36\xaa\x0b\x97\x3a\x2d\x20\x35\x40\x62\x9e\x9d\xe6\x57\xe2\x04\xef\x34\x2f\x59\x45\x33\x35\xd4\x02\x97\x27\x72\x86\x3f\x7c\x43\x50\xf6\xfe\x8a\xec\x21\x89\xd2\xbb\x31\xb2\x97\x28\xc5\x95\xd7\x53\x2a\x94\xd1\x08\x0e\xa3\x03\x8e\x41\xaa\x35\xfa\x6b\x0c\xe8\xa3\xce\x5f"..., iov_len=1786}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 1786 [ 69.360439][ C0] ------------[ cut here ]------------ [ 69.366073][ C0] refcount_t: underflow; use-after-free. [ 69.372223][ C0] WARNING: CPU: 0 PID: 16 at lib/refcount.c:28 refcount_warn_saturate+0x15a/0x1d0 [ 69.381527][ C0] Modules linked in: [ 69.385461][ C0] CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0 [ 69.395724][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 69.405881][ C0] RIP: 0010:refcount_warn_saturate+0x15a/0x1d0 [ 69.412076][ C0] Code: e0 64 5f 8c e8 17 33 a9 fc 90 0f 0b 90 90 eb 99 e8 8b 8d e8 fc c6 05 d6 15 59 0b 01 90 48 c7 c7 40 65 5f 8c e8 f7 32 a9 fc 90 <0f> 0b 90 90 e9 76 ff ff ff e8 68 8d e8 fc c6 05 b0 15 59 0b 01 90 [ 69.431719][ C0] RSP: 0018:ffffc900001574e0 EFLAGS: 00010246 [ 69.437783][ C0] RAX: 8f8c4778d0f82800 RBX: ffff88803015fd64 RCX: ffff88801beeda00 [ 69.445803][ C0] RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 [ 69.453805][ C0] RBP: 0000000000000003 R08: ffffffff815687d2 R09: 1ffff9200002ae38 [ 69.461815][ C0] R10: dffffc0000000000 R11: fffff5200002ae39 R12: ffff8880346d2468 [ 69.469858][ C0] R13: ffff88803015fd64 R14: 1ffff110068da498 R15: ffff8880346d2400 [ 69.477854][ C0] FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 [ 69.486843][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.493475][ C0] CR2: 0000000020001000 CR3: 000000002f6f4000 CR4: 00000000003526f0 [ 69.501491][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 69.509499][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 69.517475][ C0] Call Trace: [ 69.520801][ C0] [ 69.523747][ C0] ? __warn+0x168/0x4e0 [ 69.527896][ C0] ? refcount_warn_saturate+0x15a/0x1d0 [ 69.533484][ C0] ? report_bug+0x2b3/0x500 [ 69.538021][ C0] ? refcount_warn_saturate+0x15a/0x1d0 [ 69.543610][ C0] ? handle_bug+0x60/0x90 [ 69.547953][ C0] ? exc_invalid_op+0x1a/0x50 [ 69.552663][ C0] ? asm_exc_invalid_op+0x1a/0x20 [ 69.557702][ C0] ? __warn_printk+0x292/0x360 [ 69.562509][ C0] ? refcount_warn_saturate+0x15a/0x1d0 [ 69.568073][ C0] j1939_session_put+0x1ed/0x440 [ 69.573060][ C0] j1939_tp_recv+0x7fe/0x1050 [ 69.577760][ C0] j1939_can_recv+0x732/0xb20 [ 69.582482][ C0] ? __pfx_j1939_can_recv+0x10/0x10 [ 69.587701][ C0] ? __lock_acquire+0x1397/0x2100 [ 69.592769][ C0] ? __pfx_j1939_can_recv+0x10/0x10 [ 69.597992][ C0] can_rcv_filter+0x359/0x7f0 [ 69.602738][ C0] can_receive+0x327/0x480 [ 69.607184][ C0] ? can_receive+0x1c9/0x480 [ 69.611837][ C0] can_rcv+0x144/0x260 [ 69.615934][ C0] ? __pfx_can_rcv+0x10/0x10 [ 69.620558][ C0] __netif_receive_skb+0x2e0/0x650 [ 69.625691][ C0] ? __pfx_lock_acquire+0x10/0x10 [ 69.630756][ C0] ? __pfx___netif_receive_skb+0x10/0x10 [ 69.636401][ C0] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 69.642417][ C0] ? __pfx_lock_release+0x10/0x10 [ 69.647463][ C0] ? _raw_spin_lock_irq+0xdf/0x120 [ 69.652623][ C0] process_backlog+0x662/0x15b0 [ 69.657490][ C0] ? process_backlog+0x33b/0x15b0 [ 69.662557][ C0] ? __pfx_process_backlog+0x10/0x10 [ 69.667852][ C0] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 69.673870][ C0] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 69.680249][ C0] __napi_poll+0xcb/0x490 [ 69.684587][ C0] net_rx_action+0x89b/0x1240 [ 69.689322][ C0] ? __pfx_net_rx_action+0x10/0x10 [ 69.694450][ C0] ? rcu_qs+0xf1/0x190 [ 69.698516][ C0] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 69.704943][ C0] handle_softirqs+0x2c5/0x980 [ 69.709797][ C0] ? run_ksoftirqd+0xca/0x130 [ 69.714493][ C0] ? __pfx_handle_softirqs+0x10/0x10 [ 69.719843][ C0] run_ksoftirqd+0xca/0x130 [ 69.724385][ C0] ? __pfx_run_ksoftirqd+0x10/0x10 [ 69.729541][ C0] ? __pfx_ksoftirqd_should_run+0x10/0x10 [ 69.735290][ C0] ? __pfx_ksoftirqd_should_run+0x10/0x10 [ 69.741062][ C0] ? smpboot_thread_fn+0x2d3/0xa30 [ 69.746197][ C0] ? smpboot_thread_fn+0x4fb/0xa30 [ 69.751390][ C0] ? smpboot_thread_fn+0x656/0xa30 [ 69.756528][ C0] ? __pfx_run_ksoftirqd+0x10/0x10 [ 69.761674][ C0] smpboot_thread_fn+0x544/0xa30 [ 69.766645][ C0] ? smpboot_thread_fn+0x4e/0xa30 [ 69.771747][ C0] ? __pfx_smpboot_thread_fn+0x10/0x10 [ 69.777231][ C0] kthread+0x2f0/0x390 [ 69.781339][ C0] ? __pfx_smpboot_thread_fn+0x10/0x10 [ 69.786820][ C0] ? __pfx_kthread+0x10/0x10 [ 69.791458][ C0] ret_from_fork+0x4b/0x80 [ 69.795894][ C0] ? __pfx_kthread+0x10/0x10 [ 69.800524][ C0] ret_from_fork_asm+0x1a/0x30 [ 69.805322][ C0] [ 69.808335][ C0] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 69.815606][ C0] CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0 [ 69.825835][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 [ 69.835885][ C0] Call Trace: [ 69.839167][ C0] [ 69.842105][ C0] dump_stack_lvl+0x241/0x360 [ 69.846788][ C0] ? __pfx_dump_stack_lvl+0x10/0x10 [ 69.852001][ C0] ? __pfx__printk+0x10/0x10 [ 69.856596][ C0] ? vscnprintf+0x5d/0x90 [ 69.860940][ C0] panic+0x349/0x880 [ 69.864850][ C0] ? __warn+0x177/0x4e0 [ 69.869013][ C0] ? __pfx_panic+0x10/0x10 [ 69.873443][ C0] ? ret_from_fork_asm+0x1a/0x30 [ 69.878387][ C0] __warn+0x34b/0x4e0 [ 69.882367][ C0] ? refcount_warn_saturate+0x15a/0x1d0 [ 69.887919][ C0] report_bug+0x2b3/0x500 [ 69.892253][ C0] ? refcount_warn_saturate+0x15a/0x1d0 [ 69.897800][ C0] handle_bug+0x60/0x90 [ 69.901957][ C0] exc_invalid_op+0x1a/0x50 [ 69.906455][ C0] asm_exc_invalid_op+0x1a/0x20 [ 69.911300][ C0] RIP: 0010:refcount_warn_saturate+0x15a/0x1d0 [ 69.917449][ C0] Code: e0 64 5f 8c e8 17 33 a9 fc 90 0f 0b 90 90 eb 99 e8 8b 8d e8 fc c6 05 d6 15 59 0b 01 90 48 c7 c7 40 65 5f 8c e8 f7 32 a9 fc 90 <0f> 0b 90 90 e9 76 ff ff ff e8 68 8d e8 fc c6 05 b0 15 59 0b 01 90 [ 69.937056][ C0] RSP: 0018:ffffc900001574e0 EFLAGS: 00010246 [ 69.943123][ C0] RAX: 8f8c4778d0f82800 RBX: ffff88803015fd64 RCX: ffff88801beeda00 [ 69.951094][ C0] RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 [ 69.959057][ C0] RBP: 0000000000000003 R08: ffffffff815687d2 R09: 1ffff9200002ae38 [ 69.967040][ C0] R10: dffffc0000000000 R11: fffff5200002ae39 R12: ffff8880346d2468 [ 69.975009][ C0] R13: ffff88803015fd64 R14: 1ffff110068da498 R15: ffff8880346d2400 [ 69.982985][ C0] ? __warn_printk+0x292/0x360 [ 69.987753][ C0] j1939_session_put+0x1ed/0x440 [ 69.992696][ C0] j1939_tp_recv+0x7fe/0x1050 [ 69.997373][ C0] j1939_can_recv+0x732/0xb20 [ 70.002053][ C0] ? __pfx_j1939_can_recv+0x10/0x10 [ 70.007255][ C0] ? __lock_acquire+0x1397/0x2100 [ 70.012277][ C0] ? __pfx_j1939_can_recv+0x10/0x10 [ 70.017904][ C0] can_rcv_filter+0x359/0x7f0 [ 70.022579][ C0] can_receive+0x327/0x480 [ 70.026993][ C0] ? can_receive+0x1c9/0x480 [ 70.031584][ C0] can_rcv+0x144/0x260 [ 70.035652][ C0] ? __pfx_can_rcv+0x10/0x10 [ 70.040238][ C0] __netif_receive_skb+0x2e0/0x650 [ 70.045351][ C0] ? __pfx_lock_acquire+0x10/0x10 [ 70.050372][ C0] ? __pfx___netif_receive_skb+0x10/0x10 [ 70.056010][ C0] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 70.061985][ C0] ? __pfx_lock_release+0x10/0x10 [ 70.067029][ C0] ? _raw_spin_lock_irq+0xdf/0x120 [ 70.072152][ C0] process_backlog+0x662/0x15b0 [ 70.077001][ C0] ? process_backlog+0x33b/0x15b0 [ 70.082022][ C0] ? __pfx_process_backlog+0x10/0x10 [ 70.087301][ C0] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 70.093278][ C0] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 70.099606][ C0] __napi_poll+0xcb/0x490 [ 70.103945][ C0] net_rx_action+0x89b/0x1240 [ 70.108629][ C0] ? __pfx_net_rx_action+0x10/0x10 [ 70.113734][ C0] ? rcu_qs+0xf1/0x190 [ 70.117807][ C0] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 70.124141][ C0] handle_softirqs+0x2c5/0x980 [ 70.128908][ C0] ? run_ksoftirqd+0xca/0x130 [ 70.133580][ C0] ? __pfx_handle_softirqs+0x10/0x10 [ 70.138873][ C0] run_ksoftirqd+0xca/0x130 [ 70.143369][ C0] ? __pfx_run_ksoftirqd+0x10/0x10 [ 70.148470][ C0] ? __pfx_ksoftirqd_should_run+0x10/0x10 [ 70.154193][ C0] ? __pfx_ksoftirqd_should_run+0x10/0x10 [ 70.159913][ C0] ? smpboot_thread_fn+0x2d3/0xa30 [ 70.165029][ C0] ? smpboot_thread_fn+0x4fb/0xa30 [ 70.170137][ C0] ? smpboot_thread_fn+0x656/0xa30 [ 70.175244][ C0] ? __pfx_run_ksoftirqd+0x10/0x10 [ 70.180369][ C0] smpboot_thread_fn+0x544/0xa30 [ 70.185308][ C0] ? smpboot_thread_fn+0x4e/0xa30 [ 70.190337][ C0] ? __pfx_smpboot_thread_fn+0x10/0x10 [ 70.195795][ C0] kthread+0x2f0/0x390 [ 70.199864][ C0] ? __pfx_smpboot_thread_fn+0x10/0x10 [ 70.205321][ C0] ? __pfx_kthread+0x10/0x10 [ 70.209907][ C0] ret_from_fork+0x4b/0x80 [ 70.214313][ C0] ? __pfx_kthread+0x10/0x10 [ 70.218899][ C0] ret_from_fork_asm+0x1a/0x30 [ 70.223673][ C0] [ 70.226818][ C0] Kernel Offset: disabled [ 70.231168][ C0] Rebooting in 86400 seconds..