RBP: 00007f204aaea1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffea5cdb19f R14: 00007f204aaea300 R15: 0000000000022000 CPU: 1 PID: 9714 Comm: syz-executor.0 Not tainted 5.10.173 #1 general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:118 CPU: 0 PID: 9708 Comm: syz-executor.7 Not tainted 5.10.173 #1 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 should_failslab+0x5/0x20 mm/slab_common.c:1193 RIP: 0010:io_arm_poll_handler io_uring/io_uring.c:5795 [inline] RIP: 0010:__io_queue_sqe+0x69f/0xa60 io_uring/io_uring.c:7043 slab_pre_alloc_hook mm/slab.h:515 [inline] slab_alloc_node mm/slub.c:2821 [inline] __kmalloc_node_track_caller+0x74/0x310 mm/slub.c:4496 Code: 0f 85 24 03 00 00 48 8b 3d d6 8a da 02 ba 48 00 00 00 be 20 0a 00 00 e8 cf ce 7d ff 48 8d 78 14 49 89 c5 48 89 f8 48 c1 e8 03 <42> 0f b6 14 20 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xb1/0x5b0 net/core/skbuff.c:210 RSP: 0018:ffff888048aa7b28 EFLAGS: 00010213 alloc_skb include/linux/skbuff.h:1101 [inline] alloc_skb_with_frags+0x92/0x570 net/core/skbuff.c:5892 sock_alloc_send_pskb+0x7af/0x930 net/core/sock.c:2348 RAX: 0000000000000002 RBX: 1ffff11009154f6b RCX: 0000000000000000 RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000014 RBP: ffff88801d10a640 R08: 0000000000000000 R09: ffffffff8509e133 R10: fffffbfff0a13c26 R11: 0000000000000001 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88801d10a698 R15: ffff88801d10a688 __ip6_append_data.isra.0+0x1c12/0x3a70 net/ipv6/ip6_output.c:1661 FS: 00007f204aaea700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f204aae9f78 CR3: 00000000489b8000 CR4: 0000000000350ef0 Call Trace: io_queue_sqe io_uring/io_uring.c:7071 [inline] io_submit_sqe io_uring/io_uring.c:7248 [inline] io_submit_sqes+0x4484/0x86e0 io_uring/io_uring.c:7354 ip6_make_skb+0x2de/0x4e0 net/ipv6/ip6_output.c:2023 __do_sys_io_uring_enter+0x6b5/0x17b0 io_uring/io_uring.c:10083 udpv6_sendmsg+0x2060/0x2a00 net/ipv6/udp.c:1526 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 inet6_sendmsg+0x105/0x140 net/ipv6/af_inet6.c:638 entry_SYSCALL_64_after_hwframe+0x61/0xc6 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xf2/0x190 net/socket.c:671 RIP: 0033:0x7f204d574b19 ____sys_sendmsg+0x334/0x870 net/socket.c:2356 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f204aaea188 EFLAGS: 00000246 ___sys_sendmsg+0xf3/0x170 net/socket.c:2410 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 00007f204d687f60 RCX: 00007f204d574b19 RDX: 0000000000000000 RSI: 00000000000076d3 RDI: 0000000000000003 RBP: 00007f204aaea1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffea5cdb19f R14: 00007f204aaea300 R15: 0000000000022000 __sys_sendmmsg+0x195/0x470 net/socket.c:2496 Modules linked in: ---[ end trace 094c3833c26ec773 ]--- RIP: 0010:io_arm_poll_handler io_uring/io_uring.c:5795 [inline] RIP: 0010:__io_queue_sqe+0x69f/0xa60 io_uring/io_uring.c:7043 Code: 0f 85 24 03 00 00 48 8b 3d d6 8a da 02 ba 48 00 00 00 be 20 0a 00 00 e8 cf ce 7d ff 48 8d 78 14 49 89 c5 48 89 f8 48 c1 e8 03 <42> 0f b6 14 20 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 __do_sys_sendmmsg net/socket.c:2525 [inline] __se_sys_sendmmsg net/socket.c:2522 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2522 RSP: 0018:ffff888048aa7b28 EFLAGS: 00010213 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RAX: 0000000000000002 RBX: 1ffff11009154f6b RCX: 0000000000000000 RIP: 0033:0x7f6639ba0b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6637116188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f6639cb3f60 RCX: 00007f6639ba0b19 RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000014 RDX: 000000000000002f RSI: 0000000020004d00 RDI: 0000000000000004 RBP: 00007f66371161d0 R08: 0000000000000000 R09: 0000000000000000 RBP: ffff88801d10a640 R08: 0000000000000000 R09: ffffffff8509e133 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffdf756f66f R14: 00007f6637116300 R15: 0000000000022000 R10: fffffbfff0a13c26 R11: 0000000000000001 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff88801d10a698 R15: ffff88801d10a688 FS: 00007f204aaea700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f204aae9f78 CR3: 00000000489b8000 CR4: 0000000000350ef0 FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 9712 Comm: syz-executor.3 Tainted: G D 5.10.173 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x167 lib/dump_stack.c:118 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 _copy_to_user+0x2e/0x180 lib/usercopy.c:36 copy_to_user include/linux/uaccess.h:200 [inline] simple_read_from_buffer+0xcc/0x160 fs/libfs.c:729 proc_fail_nth_read+0x198/0x230 fs/proc/base.c:1423 vfs_read+0x228/0x580 fs/read_write.c:494 ksys_read+0x12d/0x260 fs/read_write.c:634 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f7f47c6369c Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 fc ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 2f fd ff ff 48 RSP: 002b:00007f7f45226170 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00007f7f47c6369c RDX: 000000000000000f RSI: 00007f7f452261e0 RDI: 0000000000000005 RBP: 00007f7f452261d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000100 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc2c2afd0f R14: 00007f7f45226300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 0f 85 24 03 00 00 jne 0x32a 6: 48 8b 3d d6 8a da 02 mov 0x2da8ad6(%rip),%rdi # 0x2da8ae3 d: ba 48 00 00 00 mov $0x48,%edx 12: be 20 0a 00 00 mov $0xa20,%esi 17: e8 cf ce 7d ff callq 0xff7dceeb 1c: 48 8d 78 14 lea 0x14(%rax),%rdi 20: 49 89 c5 mov %rax,%r13 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 14 20 movzbl (%rax,%r12,1),%edx <-- trapping instruction 2f: 48 89 f8 mov %rdi,%rax 32: 83 e0 07 and $0x7,%eax 35: 83 c0 03 add $0x3,%eax 38: 38 d0 cmp %dl,%al 3a: 7c 08 jl 0x44 3c: 84 d2 test %dl,%dl 3e: 0f .byte 0xf 3f: 85 .byte 0x85