On Tue, Jun 6, 2017 at 12:30 PM, Gene Blue <geneblue.m...@gmail.com> wrote: > Hi: > I got this crash when fuzzing the kernel with syzkaller. > > My kernel version is 4.11.0-rc1 directly download from kernel.org. > > And this crash is reproducible. Three times in total during the period of > fuzzing.
Hi! This has already been reported and fixed: https://groups.google.com/forum/#!topic/syzkaller/e3I2c8X2oWo https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=232cd35d0804cc241eb887bb8d4d9b3b9881c64a I've added a note about checking whether the bug was reported previously to syzkaller wiki: https://github.com/google/syzkaller/wiki/Reporting-kernel-bugs Thanks! > > > ********************************************************************** > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] SMP KASAN > Dumping ftrace buffer: > (ftrace buffer empty) > Modules linked in: > CPU: 3 PID: 5291 Comm: syz-executor3 Not tainted 4.11.0-rc1 #7 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > task: ffff88003cc82dc0 task.stack: ffff88003df10000 > RIP: 0010:get_freepointer mm/slub.c:243 [inline] > RIP: 0010:deactivate_slab+0xa8/0x550 mm/slub.c:2020 > RSP: 0018:ffff88003df17250 EFLAGS: 00010002 > RAX: 0000000000000001 RBX: ffff88003e80ed40 RCX: 0000000000000000 > RDX: ffff88006d66d6c0 RSI: 0000000000000000 RDI: ffffea0001b59a00 > RBP: ffff88003df17348 R08: 0000000000008000 R09: 0000000000008007 > R10: ffff88006d66b410 R11: ffff88006d669018 R12: ffff88003e80ed48 > R13: 2bcbe23c521cd9a5 R14: 2bcbe23c521cd9a5 R15: ffffea0001b59a00 > FS: 00007fb559210700(0000) GS:ffff88006e300000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020e76fc8 CR3: 000000003c2c0000 CR4: 00000000000006e0 > Call Trace: > ___slab_alloc+0x199/0x5d0 mm/slub.c:2595 > __slab_alloc+0x4c/0x90 mm/slub.c:2621 > slab_alloc_node mm/slub.c:2684 [inline] > __kmalloc_node_track_caller+0xa7/0x3a0 mm/slub.c:4303 > __kmalloc_reserve.isra.37+0x41/0xe0 net/core/skbuff.c:138 > __alloc_skb+0xf0/0x590 net/core/skbuff.c:231 > alloc_skb include/linux/skbuff.h:933 [inline] > alloc_skb_with_frags+0xae/0x510 net/core/skbuff.c:4661 > sock_alloc_send_pskb+0x5e5/0x750 net/core/sock.c:1892 > sock_alloc_send_skb+0x32/0x40 net/core/sock.c:1909 > __ip6_append_data.isra.43+0x2058/0x3560 net/ipv6/ip6_output.c:1462 > ip6_append_data+0x1d1/0x310 net/ipv6/ip6_output.c:1628 > udpv6_sendmsg+0x1339/0x2550 net/ipv6/udp.c:1264 > inet_sendmsg+0x129/0x530 net/ipv4/af_inet.c:761 > sock_sendmsg_nosec net/socket.c:633 [inline] > sock_sendmsg+0xcc/0x110 net/socket.c:643 > SYSC_sendto+0x211/0x340 net/socket.c:1685 > SyS_sendto+0x40/0x50 net/socket.c:1653 > entry_SYSCALL_64_fastpath+0x1f/0xc2 > RIP: 0033:0x4458d9 > RSP: 002b:00007fb55920fb58 EFLAGS: 00000282 ORIG_RAX: 000000000000002c > RAX: ffffffffffffffda RBX: 0000000000708000 RCX: 00000000004458d9 > RDX: 0000000000000746 RSI: 0000000020e7a8ba RDI: 0000000000000006 > RBP: 0000000000000046 R08: 0000000020e78000 R09: 000000000000001c > R10: 0000000000008800 R11: 0000000000000282 R12: 00000000006df570 > R13: 0000000000000006 R14: 0000000000000005 R15: 0000000000000000 > Code: 8b 57 10 49 8b 4f 18 49 89 54 35 00 48 89 4c 24 68 66 83 6c 24 68 01 > 80 7c 24 6b 00 78 c6 0f 0b 48 63 73 20 49 8b 57 10 4d 89 f5 <49> 8b 3c 36 48 > 85 ff 74 05 49 89 fe eb ca 4c 8b 5c 24 48 4d 8d > RIP: get_freepointer mm/slub.c:243 [inline] RSP: ffff88003df17250 > RIP: deactivate_slab+0xa8/0x550 mm/slub.c:2020 RSP: ffff88003df17250 > ---[ end trace d549158f7aadbc1f ]--- > Kernel panic - not syncing: Fatal exception > ------------[ cut here ]------------ > WARNING: CPU: 2 PID: 5279 at arch/x86/kernel/smp.c:127 > native_smp_send_reschedule+0x80/0xa0 arch/x86/kernel/smp.c:127 > Shutting down cpus with NMI > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. >
