./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2057030371 <...> Warning: Permanently added '10.128.1.206' (ED25519) to the list of known hosts. execve("./syz-executor2057030371", ["./syz-executor2057030371"], 0x7ffe7c7788b0 /* 10 vars */) = 0 brk(NULL) = 0x555570dbd000 brk(0x555570dbdd00) = 0x555570dbdd00 arch_prctl(ARCH_SET_FS, 0x555570dbd380) = 0 set_tid_address(0x555570dbd650) = 5847 set_robust_list(0x555570dbd660, 24) = 0 rseq(0x555570dbdca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor2057030371", 4096) = 28 getrandom("\x08\x40\x09\xe6\xd1\x3a\x1a\x26", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555570dbdd00 brk(0x555570dded00) = 0x555570dded00 brk(0x555570ddf000) = 0x555570ddf000 mprotect(0x7f1afeeae000, 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 5848 attached [pid 5848] set_robust_list(0x555570dbd660, 24 [pid 5847] <... clone resumed>, child_tidptr=0x555570dbd650) = 5848 [pid 5848] <... set_robust_list resumed>) = 0 [pid 5848] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5848] getppid() = 0 [pid 5848] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0 [pid 5848] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0 [pid 5848] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0 [pid 5848] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0 [pid 5848] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0 [pid 5848] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0 [pid 5848] unshare(CLONE_NEWNS) = 0 [pid 5848] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0 [pid 5848] unshare(CLONE_NEWIPC) = 0 [pid 5848] unshare(CLONE_NEWCGROUP) = 0 [pid 5848] unshare(CLONE_NEWUTS) = 0 [pid 5848] unshare(CLONE_SYSVSEM) = 0 [pid 5848] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5848] write(3, "16777216", 8) = 8 [pid 5848] close(3) = 0 [pid 5848] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3 [pid 5848] write(3, "536870912", 9) = 9 [pid 5848] close(3) = 0 [pid 5848] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5848] write(3, "1024", 4) = 4 [pid 5848] close(3) = 0 [pid 5848] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5848] write(3, "8192", 4) = 4 [pid 5848] close(3) = 0 [pid 5848] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5848] write(3, "1024", 4) = 4 [pid 5848] close(3) = 0 [pid 5848] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3 [pid 5848] write(3, "1024", 4) = 4 [pid 5848] close(3) = 0 [pid 5848] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3 [pid 5848] write(3, "1024 1048576 500 1024", 21) = 21 [pid 5848] close(3) = 0 [pid 5848] getpid() = 1 [pid 5848] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1< [pid 5857] set_robust_list(0x555570dbd660, 24 [pid 5848] <... clone resumed>, child_tidptr=0x555570dbd650) = 2 [pid 5857] <... set_robust_list resumed>) = 0 [pid 5857] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5857] setpgid(0, 0) = 0 [pid 5857] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5857] write(3, "1000", 4) = 4 [pid 5857] close(3) = 0 [pid 5857] write(1, "executing program\n", 18executing program ) = 18 [pid 5857] socket(AF_CAN, SOCK_DGRAM, CAN_J1939) = 3 [pid 5857] ioctl(3, SIOCGIFINDEX, {ifr_name="vcan0", ifr_ifindex=13}) = 0 [pid 5857] bind(3, {sa_family=AF_CAN, sa_data="\x00\x00\x0d\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, 24) = 0 [pid 5857] connect(3, {sa_family=AF_CAN, sa_data="\x00\x00\x0d\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, 24) = 0 [pid 5857] sendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\xb2\xbb\x20\xdb\x19\x69\xb2\x22\x73\x8b\x76\x64\x01\xdd\x5a\xac\xd5\x4d\xf2\x17\xfe\xd9\xcc\xea\x1b\xb3\x6f\xf9\x4b\x89\x3e\xcc\x54\x7b\x4b\xa0\xfa\x0e\xef\xa5\x99\x61\xde\x3b\xd7\x5b\x5d\x25\x2d\xa6\xf8\x12\x52\xfe\x27\x6f\xc5\xa9\x75\x54\x63\xdd\x84\x1a\x97\x89\x9b\x47\x9e\x1c\x5e\xae\xb0\x41\x9b\x0c\x11\xf3\x69\x5e\x95\xd5\xd0\xde\x2c\x96\x65\x00\x38\xac\xd5\x59\xca\x71\x15\x0f\x0c\xf3\x77\x6c"..., iov_len=172}, {iov_base=NULL, iov_len=0}, {iov_base=NULL, iov_len=0}, {iov_base=NULL, iov_len=0}, {iov_base=NULL, iov_len=0}, {iov_base=NULL, iov_len=0}, {iov_base=NULL, iov_len=0}, {iov_base=NULL, iov_len=0}], msg_iovlen=8, msg_controllen=0, msg_flags=0}, MSG_PROBE|MSG_DONTWAIT|MSG_CONFIRM|MSG_NOSIGNAL) = 172 [ 74.059312][ C1] ------------[ cut here ]------------ [ 74.064868][ C1] refcount_t: underflow; use-after-free. [ 74.071005][ C1] WARNING: CPU: 1 PID: 24 at lib/refcount.c:28 refcount_warn_saturate+0x15a/0x1d0 [ 74.080303][ C1] Modules linked in: [ 74.084232][ C1] CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.12.0-rc6-syzkaller-01249-g774ca6d3bf24 #0 [ 74.094863][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 [ 74.105213][ C1] RIP: 0010:refcount_warn_saturate+0x15a/0x1d0 [ 74.111453][ C1] Code: a0 c4 60 8c e8 37 6a 98 fc 90 0f 0b 90 90 eb 99 e8 0b 74 d7 fc c6 05 14 a3 49 0b 01 90 48 c7 c7 00 c5 60 8c e8 17 6a 98 fc 90 <0f> 0b 90 90 e9 76 ff ff ff e8 e8 73 d7 fc c6 05 ee a2 49 0b 01 90 [ 74.131129][ C1] RSP: 0018:ffffc900001e74e0 EFLAGS: 00010246 [ 74.137204][ C1] RAX: b49f0fae8794d100 RBX: ffff888033cda864 RCX: ffff88801d2f0000 [ 74.145239][ C1] RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 [ 74.153402][ C1] RBP: 0000000000000003 R08: ffffffff8155d312 R09: fffffbfff1cf9fd0 [ 74.161521][ C1] R10: dffffc0000000000 R11: fffffbfff1cf9fd0 R12: ffff88801d738068 [ 74.169550][ C1] R13: ffff888033cda864 R14: 1ffff11003ae7018 R15: ffff88801d738000 [ 74.177523][ C1] FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 [ 74.186609][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.193243][ C1] CR2: 0000557f98005a28 CR3: 00000000279a6000 CR4: 00000000003526f0 [ 74.201270][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 74.209291][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 74.217285][ C1] Call Trace: [ 74.220625][ C1] [ 74.223603][ C1] ? __warn+0x168/0x4e0 [ 74.227757][ C1] ? refcount_warn_saturate+0x15a/0x1d0 [ 74.233390][ C1] ? report_bug+0x2b3/0x500 [ 74.237945][ C1] ? refcount_warn_saturate+0x15a/0x1d0 [ 74.243665][ C1] ? handle_bug+0x60/0x90 [ 74.248038][ C1] ? exc_invalid_op+0x1a/0x50 [ 74.252761][ C1] ? asm_exc_invalid_op+0x1a/0x20 [ 74.257806][ C1] ? __warn_printk+0x292/0x360 [ 74.262726][ C1] ? refcount_warn_saturate+0x15a/0x1d0 [ 74.268373][ C1] j1939_session_put+0x1ed/0x440 [ 74.273356][ C1] j1939_tp_recv+0x7fe/0x1050 [ 74.278039][ C1] j1939_can_recv+0x732/0xb20 [ 74.282783][ C1] ? __pfx_j1939_can_recv+0x10/0x10 [ 74.288021][ C1] ? __lock_acquire+0x1384/0x2050 [ 74.293111][ C1] ? __pfx_j1939_can_recv+0x10/0x10 [ 74.298478][ C1] can_rcv_filter+0x359/0x7f0 [ 74.303221][ C1] can_receive+0x327/0x480 [ 74.307642][ C1] ? can_receive+0x1c9/0x480 [ 74.312289][ C1] can_rcv+0x144/0x260 [ 74.316395][ C1] ? __pfx_can_rcv+0x10/0x10 [ 74.321038][ C1] __netif_receive_skb+0x2e0/0x650 [ 74.326190][ C1] ? __pfx_lock_acquire+0x10/0x10 [ 74.331427][ C1] ? __pfx___netif_receive_skb+0x10/0x10 [ 74.337096][ C1] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 74.343447][ C1] ? __pfx_lock_release+0x10/0x10 [ 74.348739][ C1] ? _raw_spin_lock_irq+0xdf/0x120 [ 74.353988][ C1] process_backlog+0x662/0x15b0 [ 74.358909][ C1] ? process_backlog+0x33b/0x15b0 [ 74.364018][ C1] ? __pfx_process_backlog+0x10/0x10 [ 74.369422][ C1] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 74.375468][ C1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 74.381865][ C1] __napi_poll+0xcb/0x490 [ 74.386228][ C1] net_rx_action+0x89b/0x1240 [ 74.390982][ C1] ? __pfx_net_rx_action+0x10/0x10 [ 74.396196][ C1] ? rcu_qs+0xf1/0x190 [ 74.400354][ C1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 74.406816][ C1] handle_softirqs+0x2c5/0x980 [ 74.411644][ C1] ? run_ksoftirqd+0xca/0x130 [ 74.416358][ C1] ? __pfx_handle_softirqs+0x10/0x10 [ 74.421704][ C1] run_ksoftirqd+0xca/0x130 [ 74.426256][ C1] ? __pfx_run_ksoftirqd+0x10/0x10 [ 74.431629][ C1] ? __pfx_run_ksoftirqd+0x10/0x10 [ 74.436777][ C1] smpboot_thread_fn+0x544/0xa30 [ 74.441784][ C1] ? smpboot_thread_fn+0x4e/0xa30 [ 74.446849][ C1] ? __pfx_smpboot_thread_fn+0x10/0x10 [ 74.452397][ C1] kthread+0x2f0/0x390 [ 74.456515][ C1] ? __pfx_smpboot_thread_fn+0x10/0x10 [ 74.462103][ C1] ? __pfx_kthread+0x10/0x10 [ 74.466724][ C1] ret_from_fork+0x4b/0x80 [ 74.471304][ C1] ? __pfx_kthread+0x10/0x10 [ 74.475945][ C1] ret_from_fork_asm+0x1a/0x30 [ 74.480775][ C1] [ 74.483830][ C1] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 74.491207][ C1] CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.12.0-rc6-syzkaller-01249-g774ca6d3bf24 #0 [ 74.501900][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 [ 74.511957][ C1] Call Trace: [ 74.515240][ C1] [ 74.518192][ C1] dump_stack_lvl+0x241/0x360 [ 74.522878][ C1] ? __pfx_dump_stack_lvl+0x10/0x10 [ 74.528088][ C1] ? __pfx__printk+0x10/0x10 [ 74.532687][ C1] ? vscnprintf+0x5d/0x90 [ 74.537037][ C1] panic+0x349/0x880 [ 74.540993][ C1] ? __warn+0x177/0x4e0 [ 74.545161][ C1] ? __pfx_panic+0x10/0x10 [ 74.549606][ C1] ? ret_from_fork_asm+0x1a/0x30 [ 74.554570][ C1] __warn+0x34b/0x4e0 [ 74.558555][ C1] ? refcount_warn_saturate+0x15a/0x1d0 [ 74.564183][ C1] report_bug+0x2b3/0x500 [ 74.568527][ C1] ? refcount_warn_saturate+0x15a/0x1d0 [ 74.574081][ C1] handle_bug+0x60/0x90 [ 74.578249][ C1] exc_invalid_op+0x1a/0x50 [ 74.582746][ C1] asm_exc_invalid_op+0x1a/0x20 [ 74.587585][ C1] RIP: 0010:refcount_warn_saturate+0x15a/0x1d0 [ 74.593735][ C1] Code: a0 c4 60 8c e8 37 6a 98 fc 90 0f 0b 90 90 eb 99 e8 0b 74 d7 fc c6 05 14 a3 49 0b 01 90 48 c7 c7 00 c5 60 8c e8 17 6a 98 fc 90 <0f> 0b 90 90 e9 76 ff ff ff e8 e8 73 d7 fc c6 05 ee a2 49 0b 01 90 [ 74.613426][ C1] RSP: 0018:ffffc900001e74e0 EFLAGS: 00010246 [ 74.619493][ C1] RAX: b49f0fae8794d100 RBX: ffff888033cda864 RCX: ffff88801d2f0000 [ 74.627454][ C1] RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 [ 74.635425][ C1] RBP: 0000000000000003 R08: ffffffff8155d312 R09: fffffbfff1cf9fd0 [ 74.643394][ C1] R10: dffffc0000000000 R11: fffffbfff1cf9fd0 R12: ffff88801d738068 [ 74.651362][ C1] R13: ffff888033cda864 R14: 1ffff11003ae7018 R15: ffff88801d738000 [ 74.659342][ C1] ? __warn_printk+0x292/0x360 [ 74.664103][ C1] j1939_session_put+0x1ed/0x440 [ 74.669048][ C1] j1939_tp_recv+0x7fe/0x1050 [ 74.673777][ C1] j1939_can_recv+0x732/0xb20 [ 74.678466][ C1] ? __pfx_j1939_can_recv+0x10/0x10 [ 74.683684][ C1] ? __lock_acquire+0x1384/0x2050 [ 74.688701][ C1] ? __pfx_j1939_can_recv+0x10/0x10 [ 74.693891][ C1] can_rcv_filter+0x359/0x7f0 [ 74.698657][ C1] can_receive+0x327/0x480 [ 74.703068][ C1] ? can_receive+0x1c9/0x480 [ 74.707654][ C1] can_rcv+0x144/0x260 [ 74.711711][ C1] ? __pfx_can_rcv+0x10/0x10 [ 74.716313][ C1] __netif_receive_skb+0x2e0/0x650 [ 74.721437][ C1] ? __pfx_lock_acquire+0x10/0x10 [ 74.726456][ C1] ? __pfx___netif_receive_skb+0x10/0x10 [ 74.732120][ C1] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 74.738101][ C1] ? __pfx_lock_release+0x10/0x10 [ 74.743138][ C1] ? _raw_spin_lock_irq+0xdf/0x120 [ 74.748257][ C1] process_backlog+0x662/0x15b0 [ 74.753136][ C1] ? process_backlog+0x33b/0x15b0 [ 74.758169][ C1] ? __pfx_process_backlog+0x10/0x10 [ 74.763533][ C1] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 74.769521][ C1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 74.775870][ C1] __napi_poll+0xcb/0x490 [ 74.780210][ C1] net_rx_action+0x89b/0x1240 [ 74.784889][ C1] ? __pfx_net_rx_action+0x10/0x10 [ 74.790176][ C1] ? rcu_qs+0xf1/0x190 [ 74.794245][ C1] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 74.800576][ C1] handle_softirqs+0x2c5/0x980 [ 74.805402][ C1] ? run_ksoftirqd+0xca/0x130 [ 74.810122][ C1] ? __pfx_handle_softirqs+0x10/0x10 [ 74.815420][ C1] run_ksoftirqd+0xca/0x130 [ 74.819922][ C1] ? __pfx_run_ksoftirqd+0x10/0x10 [ 74.825035][ C1] ? __pfx_run_ksoftirqd+0x10/0x10 [ 74.830158][ C1] smpboot_thread_fn+0x544/0xa30 [ 74.835100][ C1] ? smpboot_thread_fn+0x4e/0xa30 [ 74.840245][ C1] ? __pfx_smpboot_thread_fn+0x10/0x10 [ 74.845721][ C1] kthread+0x2f0/0x390 [ 74.849809][ C1] ? __pfx_smpboot_thread_fn+0x10/0x10 [ 74.855272][ C1] ? __pfx_kthread+0x10/0x10 [ 74.859878][ C1] ret_from_fork+0x4b/0x80 [ 74.864302][ C1] ? __pfx_kthread+0x10/0x10 [ 74.868889][ C1] ret_from_fork_asm+0x1a/0x30 [ 74.873653][ C1] [ 74.876808][ C1] Kernel Offset: disabled [ 74.881154][ C1] Rebooting in 86400 seconds..