./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor430948996 <...> Warning: Permanently added '10.128.0.112' (ED25519) to the list of known hosts. execve("./syz-executor430948996", ["./syz-executor430948996"], 0x7fff01724cf0 /* 10 vars */) = 0 brk(NULL) = 0x555582bd3000 brk(0x555582bd3d00) = 0x555582bd3d00 arch_prctl(ARCH_SET_FS, 0x555582bd3380) = 0 set_tid_address(0x555582bd3650) = 5230 set_robust_list(0x555582bd3660, 24) = 0 rseq(0x555582bd3ca0, 0x20, 0, 0x53053053) = 0 prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0 readlink("/proc/self/exe", "/root/syz-executor430948996", 4096) = 27 getrandom("\x81\x49\x7e\x07\x2d\xb7\x4b\xb5", 8, GRND_NONBLOCK) = 8 brk(NULL) = 0x555582bd3d00 brk(0x555582bf4d00) = 0x555582bf4d00 brk(0x555582bf5000) = 0x555582bf5000 mprotect(0x7f1e3efdc000, 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 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5231 attached [pid 5231] set_robust_list(0x555582bd3660, 24 [pid 5230] <... clone resumed>, child_tidptr=0x555582bd3650) = 5231 [pid 5231] <... set_robust_list resumed>) = 0 [pid 5231] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 5231] setpgid(0, 0) = 0 [pid 5231] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 5231] write(3, "1000", 4) = 4 [pid 5231] close(3) = 0 [pid 5231] write(1, "executing program\n", 18executing program ) = 18 [pid 5231] socketpair(AF_UNIX, SOCK_STREAM, 0, [3, 4]) = 0 [pid 5231] sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\xdb", iov_len=1}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_OOB|MSG_DONTWAIT) = 1 [pid 5231] recvmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=NULL, msg_iovlen=0, msg_controllen=0, msg_flags=MSG_OOB}, MSG_OOB|MSG_WAITFORONE) = 1 [pid 5231] sendmsg(4, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\x11", iov_len=1}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_OOB|MSG_NOSIGNAL|MSG_MORE) = 1 [pid 5231] recvfrom(3, "\x11", 125, MSG_DONTROUTE|MSG_TRUNC, NULL, NULL) = 1 [ 57.859820][ T5231] ================================================================== [ 57.867917][ T5231] BUG: KASAN: slab-use-after-free in unix_stream_read_actor+0xa6/0xb0 [ 57.876074][ T5231] Read of size 4 at addr ffff8880249c2544 by task syz-executor430/5231 [ 57.884285][ T5231] [ 57.886597][ T5231] CPU: 0 UID: 0 PID: 5231 Comm: syz-executor430 Not tainted 6.11.0-rc5-syzkaller-00742-gfbdaffe41adc #0 [ 57.897684][ T5231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 [ 57.907721][ T5231] Call Trace: [ 57.910977][ T5231] [ 57.913892][ T5231] dump_stack_lvl+0x241/0x360 [ 57.918558][ T5231] ? __pfx_dump_stack_lvl+0x10/0x10 [ 57.923737][ T5231] ? __pfx__printk+0x10/0x10 [ 57.928305][ T5231] ? _printk+0xd5/0x120 [ 57.932441][ T5231] ? __virt_addr_valid+0x183/0x530 [ 57.937529][ T5231] ? __virt_addr_valid+0x183/0x530 [ 57.942617][ T5231] print_report+0x169/0x550 [ 57.947102][ T5231] ? __virt_addr_valid+0x183/0x530 [ 57.952193][ T5231] ? __virt_addr_valid+0x183/0x530 [ 57.957291][ T5231] ? __virt_addr_valid+0x45f/0x530 [ 57.962375][ T5231] ? __phys_addr+0xba/0x170 [ 57.966856][ T5231] ? unix_stream_read_actor+0xa6/0xb0 [ 57.972205][ T5231] kasan_report+0x143/0x180 [ 57.976691][ T5231] ? unix_stream_read_actor+0xa6/0xb0 [ 57.982042][ T5231] unix_stream_read_actor+0xa6/0xb0 [ 57.987222][ T5231] unix_stream_recv_urg+0x1df/0x320 [ 57.992409][ T5231] unix_stream_read_generic+0x2456/0x2520 [ 57.998110][ T5231] ? aa_label_sk_perm+0x4f0/0x6d0 [ 58.003139][ T5231] ? __pfx_aa_label_sk_perm+0x10/0x10 [ 58.008511][ T5231] ? mark_lock+0x9a/0x350 [ 58.012827][ T5231] ? __pfx_unix_stream_read_generic+0x10/0x10 [ 58.018886][ T5231] ? aa_sk_perm+0x96d/0xab0 [ 58.023366][ T5231] unix_stream_recvmsg+0x22b/0x2c0 [ 58.028454][ T5231] ? __pfx_unix_stream_recvmsg+0x10/0x10 [ 58.034070][ T5231] ? __pfx_unix_stream_read_actor+0x10/0x10 [ 58.039961][ T5231] ? __pfx___might_resched+0x10/0x10 [ 58.045224][ T5231] ? aa_sock_msg_perm+0x91/0x160 [ 58.050138][ T5231] ? bpf_lsm_socket_recvmsg+0x9/0x10 [ 58.055402][ T5231] ? security_socket_recvmsg+0x90/0xb0 [ 58.060838][ T5231] ? __pfx_unix_stream_recvmsg+0x10/0x10 [ 58.066445][ T5231] sock_recvmsg+0x22f/0x280 [ 58.070924][ T5231] ____sys_recvmsg+0x1db/0x470 [ 58.075673][ T5231] ? __pfx_____sys_recvmsg+0x10/0x10 [ 58.080939][ T5231] __sys_recvmsg+0x2f0/0x3e0 [ 58.085508][ T5231] ? __pfx___sys_recvmsg+0x10/0x10 [ 58.090598][ T5231] ? lockdep_hardirqs_on+0x99/0x150 [ 58.095775][ T5231] ? _raw_spin_unlock_irq+0x2e/0x50 [ 58.100947][ T5231] ? ptrace_notify+0x279/0x380 [ 58.105699][ T5231] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 58.112022][ T5231] ? do_syscall_64+0x100/0x230 [ 58.116768][ T5231] do_syscall_64+0xf3/0x230 [ 58.121248][ T5231] ? clear_bhb_loop+0x35/0x90 [ 58.125905][ T5231] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 58.131783][ T5231] RIP: 0033:0x7f1e3ef69bf9 [ 58.136177][ T5231] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 [ 58.155760][ T5231] RSP: 002b:00007ffc5b4195f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002f [ 58.164151][ T5231] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1e3ef69bf9 [ 58.172102][ T5231] RDX: 0000000000002001 RSI: 0000000020000640 RDI: 0000000000000003 [ 58.180051][ T5231] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 58.187998][ T5231] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 58.195946][ T5231] R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 [ 58.203898][ T5231] [ 58.206894][ T5231] [ 58.209193][ T5231] Allocated by task 5231: [ 58.213490][ T5231] kasan_save_track+0x3f/0x80 [ 58.218145][ T5231] __kasan_slab_alloc+0x66/0x80 [ 58.222990][ T5231] kmem_cache_alloc_node_noprof+0x16b/0x320 [ 58.228860][ T5231] __alloc_skb+0x1c3/0x440 [ 58.233252][ T5231] alloc_skb_with_frags+0xc3/0x770 [ 58.238339][ T5231] sock_alloc_send_pskb+0x91a/0xa60 [ 58.243515][ T5231] queue_oob+0x108/0x680 [ 58.247731][ T5231] unix_stream_sendmsg+0xd24/0xf80 [ 58.252815][ T5231] __sock_sendmsg+0x221/0x270 [ 58.257465][ T5231] ____sys_sendmsg+0x525/0x7d0 [ 58.262206][ T5231] __sys_sendmsg+0x2b0/0x3a0 [ 58.266773][ T5231] do_syscall_64+0xf3/0x230 [ 58.271251][ T5231] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 58.277121][ T5231] [ 58.279419][ T5231] Freed by task 5231: [ 58.283382][ T5231] kasan_save_track+0x3f/0x80 [ 58.288047][ T5231] kasan_save_free_info+0x40/0x50 [ 58.293057][ T5231] poison_slab_object+0xe0/0x150 [ 58.297978][ T5231] __kasan_slab_free+0x37/0x60 [ 58.302723][ T5231] kmem_cache_free+0x145/0x350 [ 58.307467][ T5231] unix_stream_read_generic+0x1ef6/0x2520 [ 58.313166][ T5231] unix_stream_recvmsg+0x22b/0x2c0 [ 58.318252][ T5231] sock_recvmsg+0x22f/0x280 [ 58.322740][ T5231] __sys_recvfrom+0x256/0x3e0 [ 58.327395][ T5231] __x64_sys_recvfrom+0xde/0x100 [ 58.332321][ T5231] do_syscall_64+0xf3/0x230 [ 58.336810][ T5231] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 58.342683][ T5231] [ 58.344982][ T5231] The buggy address belongs to the object at ffff8880249c2500 [ 58.344982][ T5231] which belongs to the cache skbuff_head_cache of size 240 [ 58.359528][ T5231] The buggy address is located 68 bytes inside of [ 58.359528][ T5231] freed 240-byte region [ffff8880249c2500, ffff8880249c25f0) [ 58.373211][ T5231] [ 58.375512][ T5231] The buggy address belongs to the physical page: [ 58.381897][ T5231] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x249c2 [ 58.390633][ T5231] flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) [ 58.397719][ T5231] page_type: 0xfdffffff(slab) [ 58.402368][ T5231] raw: 00fff00000000000 ffff88801eaeb780 dead000000000122 0000000000000000 [ 58.410926][ T5231] raw: 0000000000000000 00000000800c000c 00000001fdffffff 0000000000000000 [ 58.419479][ T5231] page dumped because: kasan: bad access detected [ 58.425871][ T5231] page_owner tracks the page as allocated [ 58.431557][ T5231] page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5225, tgid 5225 (sshd), ts 57813231928, free_ts 57802496690 [ 58.450107][ T5231] post_alloc_hook+0x1f3/0x230 [ 58.454858][ T5231] get_page_from_freelist+0x2e4c/0x2f10 [ 58.460384][ T5231] __alloc_pages_noprof+0x256/0x6c0 [ 58.465561][ T5231] alloc_slab_page+0x5f/0x120 [ 58.470215][ T5231] allocate_slab+0x5a/0x2f0 [ 58.474694][ T5231] ___slab_alloc+0xcd1/0x14b0 [ 58.479344][ T5231] __slab_alloc+0x58/0xa0 [ 58.483645][ T5231] kmem_cache_alloc_noprof+0x1c1/0x2a0 [ 58.489079][ T5231] skb_clone+0x20c/0x390 [ 58.493300][ T5231] dev_queue_xmit_nit+0x419/0xc10 [ 58.498307][ T5231] dev_hard_start_xmit+0x15f/0x7e0 [ 58.503395][ T5231] sch_direct_xmit+0x2b6/0x5f0 [ 58.508134][ T5231] __dev_queue_xmit+0x1a7f/0x3e90 [ 58.513132][ T5231] ip_finish_output2+0xd41/0x1390 [ 58.518131][ T5231] __ip_queue_xmit+0x118c/0x1b80 [ 58.523043][ T5231] __tcp_transmit_skb+0x2544/0x3b30 [ 58.528220][ T5231] page last free pid 5225 tgid 5225 stack trace: [ 58.534520][ T5231] free_unref_page+0xd22/0xea0 [ 58.539265][ T5231] skb_release_data+0x6b2/0x880 [ 58.544092][ T5231] __kfree_skb+0x55/0x70 [ 58.548309][ T5231] tcp_rcv_established+0x10a5/0x2020 [ 58.553570][ T5231] tcp_v4_do_rcv+0x96d/0xc70 [ 58.558138][ T5231] __release_sock+0x214/0x350 [ 58.562790][ T5231] release_sock+0x61/0x1f0 [ 58.567183][ T5231] tcp_sendmsg+0x3a/0x50 [ 58.571398][ T5231] __sock_sendmsg+0x1a6/0x270 [ 58.576048][ T5231] sock_write_iter+0x2dd/0x400 [ 58.580793][ T5231] vfs_write+0xa72/0xc90 [ 58.585012][ T5231] ksys_write+0x1a0/0x2c0 [ 58.589317][ T5231] do_syscall_64+0xf3/0x230 [ 58.593796][ T5231] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 58.599667][ T5231] [ 58.601963][ T5231] Memory state around the buggy address: [ 58.607565][ T5231] ffff8880249c2400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 58.615601][ T5231] ffff8880249c2480: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc [ 58.623637][ T5231] >ffff8880249c2500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 58.631673][ T5231] ^ [ 58.637800][ T5231] ffff8880249c2580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc [ 58.645848][ T5231] ffff8880249c2600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 58.653882][ T5231] ================================================================== [ 58.662742][ T5231] Kernel panic - not syncing: KASAN: panic_on_warn set ... [ 58.669939][ T5231] CPU: 1 UID: 0 PID: 5231 Comm: syz-executor430 Not tainted 6.11.0-rc5-syzkaller-00742-gfbdaffe41adc #0 [ 58.681025][ T5231] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 [ 58.691061][ T5231] Call Trace: [ 58.694326][ T5231] [ 58.697242][ T5231] dump_stack_lvl+0x241/0x360 [ 58.701908][ T5231] ? __pfx_dump_stack_lvl+0x10/0x10 [ 58.707091][ T5231] ? __pfx__printk+0x10/0x10 [ 58.711668][ T5231] ? preempt_schedule+0xe1/0xf0 [ 58.716505][ T5231] ? vscnprintf+0x5d/0x90 [ 58.720830][ T5231] panic+0x349/0x860 [ 58.724710][ T5231] ? check_panic_on_warn+0x21/0xb0 [ 58.729805][ T5231] ? __pfx_panic+0x10/0x10 [ 58.734208][ T5231] ? _raw_spin_unlock_irqrestore+0x130/0x140 [ 58.740170][ T5231] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10 [ 58.746480][ T5231] ? print_report+0x502/0x550 [ 58.751149][ T5231] check_panic_on_warn+0x86/0xb0 [ 58.756071][ T5231] ? unix_stream_read_actor+0xa6/0xb0 [ 58.761430][ T5231] end_report+0x77/0x160 [ 58.765662][ T5231] kasan_report+0x154/0x180 [ 58.770155][ T5231] ? unix_stream_read_actor+0xa6/0xb0 [ 58.775523][ T5231] unix_stream_read_actor+0xa6/0xb0 [ 58.780709][ T5231] unix_stream_recv_urg+0x1df/0x320 [ 58.785897][ T5231] unix_stream_read_generic+0x2456/0x2520 [ 58.791604][ T5231] ? aa_label_sk_perm+0x4f0/0x6d0 [ 58.796614][ T5231] ? __pfx_aa_label_sk_perm+0x10/0x10 [ 58.801972][ T5231] ? mark_lock+0x9a/0x350 [ 58.806293][ T5231] ? __pfx_unix_stream_read_generic+0x10/0x10 [ 58.812354][ T5231] ? aa_sk_perm+0x96d/0xab0 [ 58.816841][ T5231] unix_stream_recvmsg+0x22b/0x2c0 [ 58.821936][ T5231] ? __pfx_unix_stream_recvmsg+0x10/0x10 [ 58.827549][ T5231] ? __pfx_unix_stream_read_actor+0x10/0x10 [ 58.833432][ T5231] ? __pfx___might_resched+0x10/0x10 [ 58.838700][ T5231] ? aa_sock_msg_perm+0x91/0x160 [ 58.843621][ T5231] ? bpf_lsm_socket_recvmsg+0x9/0x10 [ 58.848892][ T5231] ? security_socket_recvmsg+0x90/0xb0 [ 58.854338][ T5231] ? __pfx_unix_stream_recvmsg+0x10/0x10 [ 58.859952][ T5231] sock_recvmsg+0x22f/0x280 [ 58.864441][ T5231] ____sys_recvmsg+0x1db/0x470 [ 58.869196][ T5231] ? __pfx_____sys_recvmsg+0x10/0x10 [ 58.874477][ T5231] __sys_recvmsg+0x2f0/0x3e0 [ 58.879057][ T5231] ? __pfx___sys_recvmsg+0x10/0x10 [ 58.884156][ T5231] ? lockdep_hardirqs_on+0x99/0x150 [ 58.889338][ T5231] ? _raw_spin_unlock_irq+0x2e/0x50 [ 58.894522][ T5231] ? ptrace_notify+0x279/0x380 [ 58.899275][ T5231] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10 [ 58.905591][ T5231] ? do_syscall_64+0x100/0x230 [ 58.910343][ T5231] do_syscall_64+0xf3/0x230 [ 58.914837][ T5231] ? clear_bhb_loop+0x35/0x90 [ 58.919507][ T5231] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 58.925388][ T5231] RIP: 0033:0x7f1e3ef69bf9 [ 58.929790][ T5231] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 [ 58.949378][ T5231] RSP: 002b:00007ffc5b4195f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002f [ 58.957776][ T5231] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1e3ef69bf9 [ 58.965730][ T5231] RDX: 0000000000002001 RSI: 0000000020000640 RDI: 0000000000000003 [ 58.973683][ T5231] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 58.981634][ T5231] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 58.989587][ T5231] R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 [ 58.997546][ T5231] [ 59.000750][ T5231] Kernel Offset: disabled [ 59.005056][ T5231] Rebooting in 86400 seconds..