Re: WARNING: kernel stack regs at (ptrval) in syz-executor has bad 'bp' value (ptrval)

[Dmitry Vyukov <dvyukov@google.com>]

On Mon, Apr 23, 2018 at 12:20 PM, syzbot
<syzbot+795f3a2b6f5ad776cc22@syzkaller.appspotmail.com> wrote:
> Hello,
>
> syzbot hit the following crash on upstream commit
> 5ec83b22a2dd13180762c89698e4e2c2881a423c (Sun Apr 22 19:13:04 2018 +0000)
> Merge tag '4.17-rc1-SMB3-CIFS' of git://git.samba.org/sfrench/cifs-2.6
> syzbot dashboard link:
> https://syzkaller.appspot.com/bug?extid=795f3a2b6f5ad776cc22
>
> So far this crash happened 2 times on upstream.
> Unfortunately, I don't have any reproducer for this crash yet.
> Raw console output:
> https://syzkaller.appspot.com/x/log.txt?id=5291662095941632
> Kernel config:
> https://syzkaller.appspot.com/x/.config?id=1808800213120130118
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+795f3a2b6f5ad776cc22@syzkaller.appspotmail.com
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.

#syz dup:
WARNING: kernel stack regs at (ptrval) in syzkaller has bad 'bp' value (ptrval)

>         (ptrval): 0000000000455389 (0x455389)
>         (ptrval): 0000000000000033 (0x33)
>         (ptrval): 0000000000000246 (0x246)
>         (ptrval): 00007f162d156c68 (0x7f162d156c68)
>         (ptrval): 000000000000002b (0x2b)
> WARNING: kernel stack regs at         (ptrval) in syz-executor0:7766 has bad
> 'bp' value         (ptrval)
> binder: 7815:7817 got transaction to invalid handle
> binder: 7815:7817 transaction failed 29201/-22, size 0-0 line 2848
> binder: undelivered TRANSACTION_ERROR: 29201
> binder: 7941:7942 ioctl c018620b 20000000 returned -14
> binder: 7941:7942 ioctl c0306201 20000240 returned -14
> binder_alloc: binder_alloc_mmap_handler: 7941 20000000-20002000 already
> mapped failed -16
> binder: 7941:7951 ioctl c018620b 20000000 returned -14
> binder: 7941:7951 ioctl c0306201 20000240 returned -14
> FAULT_INJECTION: forcing a failure.
> name failslab, interval 1, probability 0, space 0, times 1
> CPU: 1 PID: 8218 Comm: syz-executor2 Not tainted 4.17.0-rc1+ #13
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x1b9/0x294 lib/dump_stack.c:113
>  fail_dump lib/fault-inject.c:51 [inline]
>  should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
>  __should_failslab+0x124/0x180 mm/failslab.c:32
>  should_failslab+0x9/0x14 mm/slab_common.c:1522
>  slab_pre_alloc_hook mm/slab.h:423 [inline]
>  slab_alloc mm/slab.c:3378 [inline]
>  kmem_cache_alloc_trace+0x2cb/0x780 mm/slab.c:3618
>  kmalloc include/linux/slab.h:512 [inline]
>  kzalloc include/linux/slab.h:701 [inline]
>  alloc_pipe_info+0x16d/0x580 fs/pipe.c:633
>  splice_direct_to_actor+0x6e7/0x8d0 fs/splice.c:920
>  do_splice_direct+0x2cc/0x400 fs/splice.c:1061
>  do_sendfile+0x60f/0xe00 fs/read_write.c:1440
>  __do_sys_sendfile64 fs/read_write.c:1495 [inline]
>  __se_sys_sendfile64 fs/read_write.c:1487 [inline]
>  __x64_sys_sendfile64+0x155/0x240 fs/read_write.c:1487
>  do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x455389
> RSP: 002b:00007fd5ef4adc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
> RAX: ffffffffffffffda RBX: 00007fd5ef4ae6d4 RCX: 0000000000455389
> RDX: 0000000020000140 RSI: 0000000000000013 RDI: 0000000000000014
> RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000015
> R13: 00000000000004cf R14: 00000000006fa408 R15: 0000000000000000
> FAULT_INJECTION: forcing a failure.
> name failslab, interval 1, probability 0, space 0, times 0
> CPU: 0 PID: 8252 Comm: syz-executor2 Not tainted 4.17.0-rc1+ #13
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x1b9/0x294 lib/dump_stack.c:113
>  fail_dump lib/fault-inject.c:51 [inline]
>  should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
>  __should_failslab+0x124/0x180 mm/failslab.c:32
>  should_failslab+0x9/0x14 mm/slab_common.c:1522
>  slab_pre_alloc_hook mm/slab.h:423 [inline]
>  slab_alloc mm/slab.c:3378 [inline]
>  __do_kmalloc mm/slab.c:3716 [inline]
>  __kmalloc+0x2c8/0x760 mm/slab.c:3727
>  kmalloc_array include/linux/slab.h:631 [inline]
>  kcalloc include/linux/slab.h:642 [inline]
>  alloc_pipe_info+0x2a0/0x580 fs/pipe.c:650
>  splice_direct_to_actor+0x6e7/0x8d0 fs/splice.c:920
>  do_splice_direct+0x2cc/0x400 fs/splice.c:1061
>  do_sendfile+0x60f/0xe00 fs/read_write.c:1440
>  __do_sys_sendfile64 fs/read_write.c:1495 [inline]
>  __se_sys_sendfile64 fs/read_write.c:1487 [inline]
>  __x64_sys_sendfile64+0x155/0x240 fs/read_write.c:1487
>  do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x455389
> RSP: 002b:00007fd5ef4adc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
> RAX: ffffffffffffffda RBX: 00007fd5ef4ae6d4 RCX: 0000000000455389
> RDX: 0000000020000140 RSI: 0000000000000013 RDI: 0000000000000014
> RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000015
> R13: 00000000000004cf R14: 00000000006fa408 R15: 0000000000000001
> FAULT_INJECTION: forcing a failure.
> name failslab, interval 1, probability 0, space 0, times 0
> CPU: 0 PID: 8283 Comm: syz-executor2 Not tainted 4.17.0-rc1+ #13
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x1b9/0x294 lib/dump_stack.c:113
>  fail_dump lib/fault-inject.c:51 [inline]
>  should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
>  __should_failslab+0x124/0x180 mm/failslab.c:32
>  should_failslab+0x9/0x14 mm/slab_common.c:1522
>  slab_pre_alloc_hook mm/slab.h:423 [inline]
>  slab_alloc_node mm/slab.c:3299 [inline]
>  kmem_cache_alloc_node_trace+0x26f/0x770 mm/slab.c:3661
>  __do_kmalloc_node mm/slab.c:3681 [inline]
>  __kmalloc_node+0x33/0x70 mm/slab.c:3689
>  kmalloc_node include/linux/slab.h:554 [inline]
>  kvmalloc_node+0x6b/0x100 mm/util.c:421
>  kvmalloc include/linux/mm.h:550 [inline]
>  kvmalloc_array include/linux/mm.h:566 [inline]
>  get_pages_array lib/iov_iter.c:1097 [inline]
>  pipe_get_pages_alloc lib/iov_iter.c:1123 [inline]
>  iov_iter_get_pages_alloc+0x7be/0x14e0 lib/iov_iter.c:1144
>  default_file_splice_read+0x1c7/0xad0 fs/splice.c:390
>  do_splice_to+0x12e/0x190 fs/splice.c:880
>  splice_direct_to_actor+0x268/0x8d0 fs/splice.c:952
>  do_splice_direct+0x2cc/0x400 fs/splice.c:1061
>  do_sendfile+0x60f/0xe00 fs/read_write.c:1440
>  __do_sys_sendfile64 fs/read_write.c:1495 [inline]
>  __se_sys_sendfile64 fs/read_write.c:1487 [inline]
>  __x64_sys_sendfile64+0x155/0x240 fs/read_write.c:1487
>  do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x455389
> RSP: 002b:00007fd5ef4adc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
> RAX: ffffffffffffffda RBX: 00007fd5ef4ae6d4 RCX: 0000000000455389
> RDX: 0000000020000140 RSI: 0000000000000013 RDI: 0000000000000014
> RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000015
> FAULT_INJECTION: forcing a failure.
> name failslab, interval 1, probability 0, space 0, times 0
> R13: 00000000000004cf R14: 00000000006fa408 R15: 0000000000000002
> CPU: 1 PID: 8308 Comm: syz-executor1 Not tainted 4.17.0-rc1+ #13
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x1b9/0x294 lib/dump_stack.c:113
>  fail_dump lib/fault-inject.c:51 [inline]
>  should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
>  __should_failslab+0x124/0x180 mm/failslab.c:32
>  should_failslab+0x9/0x14 mm/slab_common.c:1522
>  slab_pre_alloc_hook mm/slab.h:423 [inline]
>  slab_alloc_node mm/slab.c:3299 [inline]
>  kmem_cache_alloc_node+0x272/0x780 mm/slab.c:3642
>  __alloc_skb+0x111/0x780 net/core/skbuff.c:193
> FAULT_INJECTION: forcing a failure.
> name failslab, interval 1, probability 0, space 0, times 0
>  alloc_skb include/linux/skbuff.h:987 [inline]
>  netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline]
>  netlink_sendmsg+0xb01/0xfa0 net/netlink/af_netlink.c:1876
>  sock_sendmsg_nosec net/socket.c:629 [inline]
>  sock_sendmsg+0xd5/0x120 net/socket.c:639
>  ___sys_sendmsg+0x805/0x940 net/socket.c:2117
>  __sys_sendmsg+0x115/0x270 net/socket.c:2155
>  __do_sys_sendmsg net/socket.c:2164 [inline]
>  __se_sys_sendmsg net/socket.c:2162 [inline]
>  __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162
>  do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x455389
> RSP: 002b:00007fd1bb0a4c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 00007fd1bb0a56d4 RCX: 0000000000455389
> RDX: 0000000000000000 RSI: 0000000020023000 RDI: 0000000000000013
> RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014
> R13: 00000000000004f8 R14: 00000000006fa7e0 R15: 0000000000000000
> CPU: 0 PID: 8314 Comm: syz-executor2 Not tainted 4.17.0-rc1+ #13
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x1b9/0x294 lib/dump_stack.c:113
>  fail_dump lib/fault-inject.c:51 [inline]
>  should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
>  __should_failslab+0x124/0x180 mm/failslab.c:32
>  should_failslab+0x9/0x14 mm/slab_common.c:1522
>  slab_pre_alloc_hook mm/slab.h:423 [inline]
>  slab_alloc_node mm/slab.c:3299 [inline]
>  kmem_cache_alloc_node_trace+0x26f/0x770 mm/slab.c:3661
>  __do_kmalloc_node mm/slab.c:3681 [inline]
>  __kmalloc_node+0x33/0x70 mm/slab.c:3689
>  kmalloc_node include/linux/slab.h:554 [inline]
>  kvmalloc_node+0x6b/0x100 mm/util.c:421
>  kvmalloc include/linux/mm.h:550 [inline]
>  seq_buf_alloc fs/seq_file.c:32 [inline]
>  seq_read+0xa33/0x1520 fs/seq_file.c:211
>  do_loop_readv_writev fs/read_write.c:700 [inline]
>  do_iter_read+0x4a3/0x660 fs/read_write.c:924
>  vfs_readv+0x14f/0x1a0 fs/read_write.c:986
>  kernel_readv fs/splice.c:361 [inline]
>  default_file_splice_read+0x514/0xad0 fs/splice.c:416
>  do_splice_to+0x12e/0x190 fs/splice.c:880
>  splice_direct_to_actor+0x268/0x8d0 fs/splice.c:952
>  do_splice_direct+0x2cc/0x400 fs/splice.c:1061
>  do_sendfile+0x60f/0xe00 fs/read_write.c:1440
>  __do_sys_sendfile64 fs/read_write.c:1495 [inline]
>  __se_sys_sendfile64 fs/read_write.c:1487 [inline]
>  __x64_sys_sendfile64+0x155/0x240 fs/read_write.c:1487
>  do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x455389
> RSP: 002b:00007fd5ef4adc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
> RAX: ffffffffffffffda RBX: 00007fd5ef4ae6d4 RCX: 0000000000455389
> RDX: 0000000020000140 RSI: 0000000000000013 RDI: 0000000000000014
> RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000015
> R13: 00000000000004cf R14: 00000000006fa408 R15: 0000000000000003
> FAULT_INJECTION: forcing a failure.
> name failslab, interval 1, probability 0, space 0, times 0
> CPU: 0 PID: 8340 Comm: syz-executor2 Not tainted 4.17.0-rc1+ #13
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x1b9/0x294 lib/dump_stack.c:113
>  fail_dump lib/fault-inject.c:51 [inline]
>  should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
> FAULT_INJECTION: forcing a failure.
> name failslab, interval 1, probability 0, space 0, times 0
>  __should_failslab+0x124/0x180 mm/failslab.c:32
>  should_failslab+0x9/0x14 mm/slab_common.c:1522
>  slab_pre_alloc_hook mm/slab.h:423 [inline]
>  slab_alloc mm/slab.c:3378 [inline]
>  kmem_cache_alloc_trace+0x4b/0x780 mm/slab.c:3618
>  kmalloc include/linux/slab.h:512 [inline]
>  __memcg_schedule_kmem_cache_create mm/memcontrol.c:2195 [inline]
>  memcg_schedule_kmem_cache_create mm/memcontrol.c:2223 [inline]
>  memcg_kmem_get_cache+0x474/0x870 mm/memcontrol.c:2285
>  slab_pre_alloc_hook mm/slab.h:428 [inline]
>  slab_alloc_node mm/slab.c:3299 [inline]
>  kmem_cache_alloc_node_trace+0x1a4/0x770 mm/slab.c:3661
>  __do_kmalloc_node mm/slab.c:3681 [inline]
>  __kmalloc_node+0x33/0x70 mm/slab.c:3689
>  kmalloc_node include/linux/slab.h:554 [inline]
>  kvmalloc_node+0x6b/0x100 mm/util.c:421
>  kvmalloc include/linux/mm.h:550 [inline]
>  seq_buf_alloc fs/seq_file.c:32 [inline]
>  seq_read+0xa33/0x1520 fs/seq_file.c:211
>  do_loop_readv_writev fs/read_write.c:700 [inline]
>  do_iter_read+0x4a3/0x660 fs/read_write.c:924
>  vfs_readv+0x14f/0x1a0 fs/read_write.c:986
>  kernel_readv fs/splice.c:361 [inline]
>  default_file_splice_read+0x514/0xad0 fs/splice.c:416
>  do_splice_to+0x12e/0x190 fs/splice.c:880
>
>
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report.
> If you forgot to add the Reported-by tag, once the fix for this bug is
> merged
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