Date:   Fri, 17 Aug 2018 13:17:14 -0400
From:   tedheadster <tedheadster@...il.com>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, ast@...nel.org,
        daniel@...earbox.net
Subject: Allocation failure with subsequent kernel crash

I have been trying to bisect this crash but I have not found a
reliable reproducer. My best guess is that it was introduced after the
4.14 release.

This is a 32 bit kernel. It is odd in that it first generates a memory
allocation failure, and then quickly crashes with a succeeding bug.

I'm including the netdev group since there is a lot of BPF stacktrace.

[   42.512745] systemd: vmalloc: allocation failure: 0 bytes,
mode:0x14080c0(GFP_KERNEL|__GFP_ZERO), nodemask=(null)
[   42.526396] CPU: 0 PID: 1 Comm: systemd Not tainted
4.14.0.bisect-4.k5-tsc-desktop+ #168
[   42.535878] Hardware name:   AX5TC/AX5TC, BIOS 4.51 PG 03/23/98
[   42.540944] Call Trace:
[   42.550334]  dump_stack+0x16/0x18
[   42.558519]  warn_alloc+0xa3/0x10b
[   42.563844]  __vmalloc_node_range+0x170/0x17d
[   42.574293]  __vmalloc_node+0x35/0x3a
[   42.586454]  ? bpf_check+0x52/0x2c64
[   42.594504]  vzalloc+0x21/0x23
[   42.602499]  ? bpf_check+0x52/0x2c64
[   42.614418]  bpf_check+0x52/0x2c64
[   42.622623]  ? slob_page_alloc+0x130/0x177
[   42.642524]  ? vmap_page_range_noflush+0xe/0x109
[   42.655415]  ? slob_page_alloc+0x130/0x177
[   42.666466]  ? native_io_delay+0x8/0x2e
[   42.674455]  ? tk_clock_read+0xa/0xd
[   42.685808]  ? timekeeping_get_ns+0x10/0x70
[   42.688097]  ? ktime_get_with_offset+0x49/0x66
[   42.702478]  bpf_prog_load+0x2fc/0x442
[   42.710467]  ? bpf_prog_load+0x2fc/0x442
[   42.722474]  ? bpf_prog_array_alloc+0x1b/0x24
[   42.734478]  ? bpf_prog_array_alloc+0x1b/0x24
[   42.746532]  ? compute_effective_progs+0x5c/0xb7
[   42.758492]  ? css_next_descendant_pre+0xa/0x43
[   42.766488]  ? cap_capable+0xa/0x5d
[   42.778457]  ? security_capable+0x2d/0x40
[   42.786537]  ? __copy_from_user_ll_nocache_nozero+0xb/0x37
[   42.799175]  ? __copy_user_ll+0xd/0xf
[   42.810492]  ? security_bpf+0xc/0x3b
[   42.816807]  SyS_bpf+0x7f7/0xd79
[   42.822333]  ? __rcu_read_unlock+0x9/0x4b
[   42.834457]  ? mntput_no_expire+0x28/0x119
[   42.842525]  do_int80_syscall_32+0x45/0x57
[   42.854449]  ? do_int80_syscall_32+0x45/0x57
[   42.866486]  entry_INT80_32+0x27/0x27
[   42.878299] EIP: 0xb7a95082
[   42.881808] EFLAGS: 00000246 CPU: 0
[   42.886454] EAX: ffffffda EBX: 00000005 ECX: bfe76e40 EDX: 00000048
[   42.902452] ESI: 00000040 EDI: 00000000 EBP: 00a8a458 ESP: bfe76e0c
[   42.918413]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[   42.932627] Mem-Info:
[   42.936616] active_anon:845 inactive_anon:31 isolated_anon:0
[   42.936616]  active_file:4364 inactive_file:9478 isolated_file:0
[   42.936616]  unevictable:0 dirty:428 writeback:0 unstable:0
[   42.936616]  slab_reclaimable:0 slab_unreclaimable:0
[   42.936616]  mapped:4966 shmem:54 pagetables:46 bounce:0
[   42.936616]  free:47214 free_pcp:25 free_cma:0
[   42.946479] Node 0 active_anon:3380kB inactive_anon:124kB
active_file:17456kB inactive_file:37912kB unevictable:0kB
isolated(anon):0kB isolated(file):0kB mapped:19928kB dirty:1720kB
writeback:0kB shmem:216kB writeback_tmp:0kB unstable:0kB
all_unreclaimable? no
[   42.958503] Normal free:188856kB min:2012kB low:2512kB high:3012kB
active_anon:3380kB inactive_anon:124kB active_file:17456kB
inactive_file:37912kB unevictable:0kB writepending:1732kB
present:261756kB managed:254168kB mlocked:0kB kernel_stack:328kB
pagetables:184kB bounce:0kB free_pcp:100kB local_pcp:100kB
free_cma:0kB
[   42.970387] lowmem_reserve[]: 0 0
[   42.978444] Normal: 26*4kB (U) 34*8kB (UM) 10*16kB (UM) 5*32kB (U)
4*64kB (U) 4*128kB (U) 4*256kB (UM) 0*512kB 2*1024kB (U) 0*2048kB
45*4096kB (M) = 188856kB
[   42.986472] 13897 total pagecache pages
[   42.998400] 0 pages in swap cache
[   43.007903] Swap cache stats: add 0, delete 0, find 0/0
[   43.010200] Free swap  = 0kB
[   43.013762] Total swap = 0kB
[   43.024725] 65439 pages RAM
[   43.034360] 0 pages HighMem/MovableOnly
[   43.046385] 1897 pages reserved

[   43.054521] BUG: unable to handle kernel NULL pointer dereference at 00000004
[   43.058026] IP: free_used_maps+0xe/0x2a
[   43.058026] *pde = 00000000
[   43.058026] Oops: 0000 [#1] PREEMPT
[   43.058026] Modules linked in: uhci_hcd ehci_pci ehci_hcd usbcore
3c59x i2c_piix4 i2c_core mii usb_common autofs4
[   43.058026] CPU: 0 PID: 1 Comm: systemd Not tainted
4.14.0.bisect-4.k5-tsc-desktop+ #168
[   43.058026] Hardware name:   AX5TC/AX5TC, BIOS 4.51 PG 03/23/98
[   43.058026] task: c00177c0 task.stack: c0032000
[   43.058026] EIP: free_used_maps+0xe/0x2a
[   43.058026] EFLAGS: 00010246 CPU: 0
[   43.058026] EAX: 00000000 EBX: 00000000 ECX: cfdf60b0 EDX: cff95274
[   43.058026] ESI: 00000000 EDI: 00000008 EBP: c0033e50 ESP: c0033e48
[   43.058026]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
[   43.058026] CR0: 80050033 CR2: 00000004 CR3: 0034b000 CR4: 00000010
[   43.058026] Call Trace:
[   43.058026]  bpf_prog_load+0x3ce/0x442
[   43.058026]  ? bpf_prog_array_alloc+0x1b/0x24
[   43.058026]  ? bpf_prog_array_alloc+0x1b/0x24
[   43.058026]  ? compute_effective_progs+0x5c/0xb7
[   43.058026]  ? css_next_descendant_pre+0xa/0x43
[   43.058026]  ? cap_capable+0xa/0x5d
[   43.058026]  ? security_capable+0x2d/0x40
[   43.058026]  ? __copy_from_user_ll_nocache_nozero+0xb/0x37
[   43.058026]  ? __copy_user_ll+0xd/0xf
[   43.058026]  ? security_bpf+0xc/0x3b
[   43.058026]  SyS_bpf+0x7f7/0xd79
[   43.058026]  ? __rcu_read_unlock+0x9/0x4b
[   43.058026]  ? mntput_no_expire+0x28/0x119
[   43.058026]  do_int80_syscall_32+0x45/0x57
[   43.058026]  ? do_int80_syscall_32+0x45/0x57
[   43.058026]  entry_INT80_32+0x27/0x27
[   43.058026] EIP: 0xb7a95082
[   43.058026] EFLAGS: 00000246 CPU: 0
[   43.058026] EAX: ffffffda EBX: 00000005 ECX: bfe76e40 EDX: 00000048
[   43.058026] ESI: 00000040 EDI: 00000000 EBP: 00a8a458 ESP: bfe76e0c
[   43.058026]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[   43.058026] Code: 89 43 30 89 43 34 c7 43 38 40 8c 07 c1 8d 4b 2c
b8 01 00 00 00 e8 7b d4 fa ff 5b 5d c3 55 89 e5 56 53 e8 e4 6d f9 ff
31 db 89 c6 <39> 5e 04 8b 46 38 76 0b 8b 04 98 43 e8 9b ff ff ff eb ed
e8 5b
[   43.058026] EIP: free_used_maps+0xe/0x2a SS:ESP: 0068:c0033e48
[   43.058026] CR2: 0000000000000004
[   43.070394] ---[ end trace 76c4354246d4bc3b ]---
[   43.154492] systemd: 35 output lines suppressed due to ratelimiting
[   43.172970] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00000009
[   43.172970]
[   43.174034] Kernel Offset: disabled
[   43.174034] Rebooting in 45 seconds..

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