./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor43493950 <...> Warning: Permanently added '10.128.1.250' (ED25519) to the list of known hosts. execve("./syz-executor43493950", ["./syz-executor43493950"], 0x7ffd2c686cd0 /* 10 vars */) = 0 brk(NULL) = 0x555586803000 brk(0x555586803d00) = 0x555586803d00 arch_prctl(ARCH_SET_FS, 0x555586803380) = 0 set_tid_address(0x555586803650) = 5224 set_robust_list(0x555586803660, 24) = 0 rseq(0x555586803ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor43493950", 4096) = 26 getrandom("\xdf\xc2\x48\x61\x07\xe5\x7a\xd4", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555586803d00 brk(0x555586824d00) = 0x555586824d00 brk(0x555586825000) = 0x555586825000 mprotect(0x7fbd3d44d000, 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 5225 attached , child_tidptr=0x555586803650) = 5225 [pid 5225] set_robust_list(0x555586803660, 24) = 0 [pid 5225] mount(NULL, "/sys/fs/fuse/connections", "fusectl", 0, NULL) = -1 EBUSY (Device or resource busy) [pid 5225] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5225] setsid() = 1 [pid 5225] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0 [pid 5225] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0 [pid 5225] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0 [pid 5225] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0 [pid 5225] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0 [pid 5225] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0 [pid 5225] unshare(CLONE_NEWNS) = 0 [pid 5225] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0 [pid 5225] unshare(CLONE_NEWIPC) = 0 [pid 5225] unshare(CLONE_NEWCGROUP) = 0 [pid 5225] unshare(CLONE_NEWUTS) = 0 [pid 5225] unshare(CLONE_SYSVSEM) = 0 [pid 5225] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5225] write(3, "16777216", 8) = 8 [pid 5225] close(3) = 0 [pid 5225] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3 [pid 5225] write(3, "536870912", 9) = 9 [pid 5225] close(3) = 0 [pid 5225] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5225] write(3, "1024", 4) = 4 [pid 5225] close(3) = 0 [pid 5225] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3 [pid 5225] write(3, "8192", 4) = 4 [pid 5225] close(3) = 0 [pid 5225] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3 [pid 5225] write(3, "1024", 4) = 4 [pid 5225] close(3) = 0 [pid 5225] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3 [pid 5225] write(3, "1024", 4) = 4 [pid 5225] close(3) = 0 [pid 5225] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3 [pid 5225] write(3, "1024 1048576 500 1024", 21) = 21 [pid 5225] close(3) = 0 [pid 5225] getpid() = 1 [pid 5225] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1< [pid 5234] set_robust_list(0x555586803660, 24) = 0 [pid 5234] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5225] <... clone resumed>, child_tidptr=0x555586803650) = 2 [pid 5234] setpgid(0, 0) = 0 [pid 5234] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5234] write(3, "1000", 4) = 4 [pid 5234] close(3executing program ) = 0 [pid 5234] write(1, "executing program\n", 18) = 18 [pid 5234] socket(AF_CAN, SOCK_DGRAM, CAN_J1939) = 3 [pid 5234] socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE) = 4 [pid 5234] setsockopt(3, SOL_SOCKET, SO_BROADCAST, [1], 4) = 0 [pid 5234] ioctl(4, SIOCGIFINDEX, {ifr_name="vcan0", ifr_ifindex=13}) = 0 [pid 5234] bind(3, {sa_family=AF_CAN, sa_data="\x00\x00\x0d\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00"}, 24) = 0 [pid 5234] sendmmsg(3, [{msg_hdr={msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\xd6\x0c\x33\x67\x1a\x69\x02\xb1\x8d", iov_len=9}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, msg_len=9}], 1, 0) = 1 [ 67.416022][ C0] ------------[ cut here ]------------ [ 67.421590][ C0] refcount_t: underflow; use-after-free. [ 67.427679][ C0] WARNING: CPU: 0 PID: 0 at lib/refcount.c:28 refcount_warn_saturate+0x15a/0x1d0 [ 67.436839][ C0] Modules linked in: [ 67.440734][ C0] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.10.0-syzkaller-12610-g743ff02152bc #0 [ 67.450732][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 [ 67.460910][ C0] RIP: 0010:refcount_warn_saturate+0x15a/0x1d0 [ 67.467125][ C0] Code: 00 17 40 8c e8 67 97 a5 fc 90 0f 0b 90 90 eb 99 e8 1b 89 e3 fc c6 05 76 7d 31 0b 01 90 48 c7 c7 60 17 40 8c e8 47 97 a5 fc 90 <0f> 0b 90 90 e9 76 ff ff ff e8 f8 88 e3 fc c6 05 50 7d 31 0b 01 90 [ 67.486776][ C0] RSP: 0018:ffffc900000076a0 EFLAGS: 00010246 [ 67.492832][ C0] RAX: 9ce7031b7bf45900 RBX: ffff88802d9fc224 RCX: ffffffff8e494680 [ 67.500829][ C0] RDX: 0000000000000101 RSI: 0000000000000000 RDI: 0000000000000000 [ 67.508832][ C0] RBP: 0000000000000003 R08: ffffffff81559432 R09: fffffbfff1cb9f88 [ 67.516830][ C0] R10: dffffc0000000000 R11: fffffbfff1cb9f88 R12: ffff88802c02c468 [ 67.524812][ C0] R13: ffff88802d9fc224 R14: 1ffff11005805898 R15: ffff88802c02c400 [ 67.532815][ C0] FS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 [ 67.541798][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 67.548836][ C0] CR2: 000055b3e8e4e5d8 CR3: 000000007d3fa000 CR4: 00000000003506f0 [ 67.556838][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 67.564793][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 67.572775][ C0] Call Trace: [ 67.576059][ C0] [ 67.580157][ C0] ? __warn+0x163/0x4e0 [ 67.584310][ C0] ? refcount_warn_saturate+0x15a/0x1d0 [ 67.591493][ C0] ? report_bug+0x2b3/0x500 [ 67.596760][ C0] ? refcount_warn_saturate+0x15a/0x1d0 [ 67.603002][ C0] ? handle_bug+0x3e/0x70 [ 67.607866][ C0] ? exc_invalid_op+0x1a/0x50 [ 67.613959][ C0] ? asm_exc_invalid_op+0x1a/0x20 [ 67.619113][ C0] ? __warn_printk+0x292/0x360 [ 67.624135][ C0] ? refcount_warn_saturate+0x15a/0x1d0 [ 67.629705][ C0] j1939_session_put+0x1e7/0x440 [ 67.640107][ C0] j1939_tp_recv+0x31e/0x1050 [ 67.647283][ C0] j1939_can_recv+0x732/0xb20 [ 67.652134][ C0] ? __pfx_j1939_can_recv+0x10/0x10 [ 67.657354][ C0] ? __lock_acquire+0x137a/0x2040 [ 67.662375][ C0] ? __pfx_j1939_can_recv+0x10/0x10 [ 67.667618][ C0] can_rcv_filter+0x359/0x7f0 [ 67.672328][ C0] ? can_receive+0x1cd/0x470 [ 67.676968][ C0] can_receive+0x31c/0x470 [ 67.681394][ C0] can_rcv+0x144/0x260 [ 67.685471][ C0] ? __pfx_can_rcv+0x10/0x10 [ 67.690048][ C0] __netif_receive_skb+0x2e0/0x650 [ 67.695170][ C0] ? __pfx_lock_acquire+0x10/0x10 [ 67.700183][ C0] ? __pfx___netif_receive_skb+0x10/0x10 [ 67.705825][ C0] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 67.711794][ C0] ? __pfx_lock_release+0x10/0x10 [ 67.716829][ C0] ? _raw_spin_lock_irq+0xdf/0x120 [ 67.721936][ C0] process_backlog+0x662/0x15b0 [ 67.726799][ C0] ? process_backlog+0x33b/0x15b0 [ 67.731815][ C0] ? __pfx_process_backlog+0x10/0x10 [ 67.737103][ C0] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 67.743072][ C0] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 67.749526][ C0] __napi_poll+0xcb/0x490 [ 67.753845][ C0] net_rx_action+0x89b/0x1240 [ 67.758538][ C0] ? __pfx_net_rx_action+0x10/0x10 [ 67.763721][ C0] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 67.769720][ C0] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 67.776064][ C0] handle_softirqs+0x2c4/0x970 [ 67.780820][ C0] ? __irq_exit_rcu+0xf4/0x1c0 [ 67.785592][ C0] ? __pfx_handle_softirqs+0x10/0x10 [ 67.790867][ C0] ? irqtime_account_irq+0xd4/0x1e0 [ 67.796111][ C0] __irq_exit_rcu+0xf4/0x1c0 [ 67.800722][ C0] ? __pfx___irq_exit_rcu+0x10/0x10 [ 67.805972][ C0] irq_exit_rcu+0x9/0x30 [ 67.810228][ C0] sysvec_apic_timer_interrupt+0xa6/0xc0 [ 67.815886][ C0] [ 67.818803][ C0] [ 67.821717][ C0] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 67.827735][ C0] RIP: 0010:acpi_safe_halt+0x21/0x30 [ 67.833033][ C0] Code: 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 40 d7 03 00 48 f7 00 08 00 00 00 75 10 66 90 0f 00 2d b5 e0 94 00 f3 0f 1e fa fb f4 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 [ 67.852651][ C0] RSP: 0018:ffffffff8e407ca8 EFLAGS: 00000246 [ 67.858728][ C0] RAX: ffffffff8e494680 RBX: ffff88801b2f5864 RCX: 0000000000025c51 [ 67.866704][ C0] RDX: 0000000000000001 RSI: ffff88801b2f5800 RDI: ffff88801b2f5864 [ 67.874664][ C0] RBP: 000000000003a6b8 R08: ffff8880b9237c7b R09: 1ffff11017246f8f [ 67.882643][ C0] R10: dffffc0000000000 R11: ffffffff8bb537c0 R12: ffff88801bf89800 [ 67.890619][ C0] R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8eedb0e0 [ 67.898716][ C0] ? __pfx_acpi_idle_enter+0x10/0x10 [ 67.904982][ C0] acpi_idle_enter+0xe4/0x140 [ 67.911538][ C0] cpuidle_enter_state+0x112/0x480 [ 67.918741][ C0] ? __pfx_menu_select+0x10/0x10 [ 67.923809][ C0] cpuidle_enter+0x5d/0xa0 [ 67.928753][ C0] do_idle+0x375/0x5d0 [ 67.933732][ C0] ? __pfx_do_idle+0x10/0x10 [ 67.938450][ C0] ? poll_idle+0xb0/0xb0 [ 67.943311][ C0] ? rest_init+0x31/0x300 [ 67.947665][ C0] cpu_startup_entry+0x42/0x60 [ 67.952522][ C0] rest_init+0x2dc/0x300 [ 67.956839][ C0] ? __pfx_x86_late_time_init+0x10/0x10 [ 67.962749][ C0] start_kernel+0x47a/0x500 [ 67.967277][ C0] x86_64_start_reservations+0x2a/0x30 [ 67.973082][ C0] x86_64_start_kernel+0x9f/0xa0 [ 67.978031][ C0] common_startup_64+0x13e/0x147 [ 67.982966][ C0] [ 67.986017][ C0] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 67.993384][ C0] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.10.0-syzkaller-12610-g743ff02152bc #0 [ 68.003345][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 [ 68.014084][ C0] Call Trace: [ 68.017443][ C0] [ 68.020276][ C0] dump_stack_lvl+0x241/0x360 [ 68.024952][ C0] ? __pfx_dump_stack_lvl+0x10/0x10 [ 68.030143][ C0] ? __pfx__printk+0x10/0x10 [ 68.034740][ C0] ? vscnprintf+0x5d/0x90 [ 68.039059][ C0] panic+0x349/0x860 [ 68.043030][ C0] ? __warn+0x172/0x4e0 [ 68.047176][ C0] ? __pfx_panic+0x10/0x10 [ 68.051579][ C0] ? common_startup_64+0x13e/0x147 [ 68.056714][ C0] __warn+0x346/0x4e0 [ 68.060679][ C0] ? refcount_warn_saturate+0x15a/0x1d0 [ 68.066210][ C0] report_bug+0x2b3/0x500 [ 68.070519][ C0] ? refcount_warn_saturate+0x15a/0x1d0 [ 68.076054][ C0] handle_bug+0x3e/0x70 [ 68.080193][ C0] exc_invalid_op+0x1a/0x50 [ 68.084680][ C0] asm_exc_invalid_op+0x1a/0x20 [ 68.089519][ C0] RIP: 0010:refcount_warn_saturate+0x15a/0x1d0 [ 68.095665][ C0] Code: 00 17 40 8c e8 67 97 a5 fc 90 0f 0b 90 90 eb 99 e8 1b 89 e3 fc c6 05 76 7d 31 0b 01 90 48 c7 c7 60 17 40 8c e8 47 97 a5 fc 90 <0f> 0b 90 90 e9 76 ff ff ff e8 f8 88 e3 fc c6 05 50 7d 31 0b 01 90 [ 68.115270][ C0] RSP: 0018:ffffc900000076a0 EFLAGS: 00010246 [ 68.121330][ C0] RAX: 9ce7031b7bf45900 RBX: ffff88802d9fc224 RCX: ffffffff8e494680 [ 68.129290][ C0] RDX: 0000000000000101 RSI: 0000000000000000 RDI: 0000000000000000 [ 68.137248][ C0] RBP: 0000000000000003 R08: ffffffff81559432 R09: fffffbfff1cb9f88 [ 68.145212][ C0] R10: dffffc0000000000 R11: fffffbfff1cb9f88 R12: ffff88802c02c468 [ 68.153174][ C0] R13: ffff88802d9fc224 R14: 1ffff11005805898 R15: ffff88802c02c400 [ 68.161140][ C0] ? __warn_printk+0x292/0x360 [ 68.165906][ C0] j1939_session_put+0x1e7/0x440 [ 68.170839][ C0] j1939_tp_recv+0x31e/0x1050 [ 68.175512][ C0] j1939_can_recv+0x732/0xb20 [ 68.180186][ C0] ? __pfx_j1939_can_recv+0x10/0x10 [ 68.185382][ C0] ? __lock_acquire+0x137a/0x2040 [ 68.190402][ C0] ? __pfx_j1939_can_recv+0x10/0x10 [ 68.195587][ C0] can_rcv_filter+0x359/0x7f0 [ 68.200282][ C0] ? can_receive+0x1cd/0x470 [ 68.204864][ C0] can_receive+0x31c/0x470 [ 68.209276][ C0] can_rcv+0x144/0x260 [ 68.213333][ C0] ? __pfx_can_rcv+0x10/0x10 [ 68.217913][ C0] __netif_receive_skb+0x2e0/0x650 [ 68.223022][ C0] ? __pfx_lock_acquire+0x10/0x10 [ 68.228041][ C0] ? __pfx___netif_receive_skb+0x10/0x10 [ 68.233754][ C0] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 68.239724][ C0] ? __pfx_lock_release+0x10/0x10 [ 68.244739][ C0] ? _raw_spin_lock_irq+0xdf/0x120 [ 68.249855][ C0] process_backlog+0x662/0x15b0 [ 68.254697][ C0] ? process_backlog+0x33b/0x15b0 [ 68.259720][ C0] ? __pfx_process_backlog+0x10/0x10 [ 68.264990][ C0] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 68.270975][ C0] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 68.277296][ C0] __napi_poll+0xcb/0x490 [ 68.281615][ C0] net_rx_action+0x89b/0x1240 [ 68.286297][ C0] ? __pfx_net_rx_action+0x10/0x10 [ 68.291396][ C0] ? lockdep_hardirqs_on_prepare+0x43d/0x780 [ 68.297758][ C0] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 68.304708][ C0] handle_softirqs+0x2c4/0x970 [ 68.310446][ C0] ? __irq_exit_rcu+0xf4/0x1c0 [ 68.316527][ C0] ? __pfx_handle_softirqs+0x10/0x10 [ 68.322494][ C0] ? irqtime_account_irq+0xd4/0x1e0 [ 68.328327][ C0] __irq_exit_rcu+0xf4/0x1c0 [ 68.333333][ C0] ? __pfx___irq_exit_rcu+0x10/0x10 [ 68.338639][ C0] irq_exit_rcu+0x9/0x30 [ 68.342884][ C0] sysvec_apic_timer_interrupt+0xa6/0xc0 [ 68.348656][ C0] [ 68.351579][ C0] [ 68.354804][ C0] asm_sysvec_apic_timer_interrupt+0x1a/0x20 [ 68.361005][ C0] RIP: 0010:acpi_safe_halt+0x21/0x30 [ 68.366404][ C0] Code: 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 40 d7 03 00 48 f7 00 08 00 00 00 75 10 66 90 0f 00 2d b5 e0 94 00 f3 0f 1e fa fb f4 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 [ 68.386001][ C0] RSP: 0018:ffffffff8e407ca8 EFLAGS: 00000246 [ 68.392062][ C0] RAX: ffffffff8e494680 RBX: ffff88801b2f5864 RCX: 0000000000025c51 [ 68.400022][ C0] RDX: 0000000000000001 RSI: ffff88801b2f5800 RDI: ffff88801b2f5864 [ 68.407988][ C0] RBP: 000000000003a6b8 R08: ffff8880b9237c7b R09: 1ffff11017246f8f [ 68.415948][ C0] R10: dffffc0000000000 R11: ffffffff8bb537c0 R12: ffff88801bf89800 [ 68.423994][ C0] R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8eedb0e0 [ 68.431957][ C0] ? __pfx_acpi_idle_enter+0x10/0x10 [ 68.437247][ C0] acpi_idle_enter+0xe4/0x140 [ 68.441918][ C0] cpuidle_enter_state+0x112/0x480 [ 68.447019][ C0] ? __pfx_menu_select+0x10/0x10 [ 68.451962][ C0] cpuidle_enter+0x5d/0xa0 [ 68.456392][ C0] do_idle+0x375/0x5d0 [ 68.460467][ C0] ? __pfx_do_idle+0x10/0x10 [ 68.465048][ C0] ? poll_idle+0xb0/0xb0 [ 68.469292][ C0] ? rest_init+0x31/0x300 [ 68.473611][ C0] cpu_startup_entry+0x42/0x60 [ 68.478368][ C0] rest_init+0x2dc/0x300 [ 68.482602][ C0] ? __pfx_x86_late_time_init+0x10/0x10 [ 68.488158][ C0] start_kernel+0x47a/0x500 [ 68.492680][ C0] x86_64_start_reservations+0x2a/0x30 [ 68.498160][ C0] x86_64_start_kernel+0x9f/0xa0 [ 68.503114][ C0] common_startup_64+0x13e/0x147 [ 68.508058][ C0] [ 68.511389][ C0] Kernel Offset: disabled [ 68.515730][ C0] Rebooting in 86400 seconds..