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WARNING: kmalloc bug in cpu_map_update_elem

Status: fixed on 2018/02/26 20:04
Subsystems: bpf net
[Documentation on labels]
Fix commit: 7fc17e909edf bpf: cpumap: use GFP_KERNEL instead of GFP_ATOMIC in __cpu_map_entry_alloc()
First crash: 2490d, last: 2478d

Sample crash report:
audit: type=1400 audit(1518674852.804:7): avc:  denied  { map } for  pid=4095 comm="syzkaller851878" path="/root/syzkaller851878855" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
WARNING: CPU: 1 PID: 4095 at mm/util.c:403 kvmalloc_node+0xc3/0xd0 mm/util.c:403
audit: type=1400 audit(1518674852.804:8): avc:  denied  { map_create } for  pid=4095 comm="syzkaller851878" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4095 Comm: syzkaller851878 Not tainted 4.16.0-rc1+ #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
audit: type=1400 audit(1518674852.804:9): avc:  denied  { map_read map_write } for  pid=4095 comm="syzkaller851878" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf permissive=1
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:988
RIP: 0010:kvmalloc_node+0xc3/0xd0 mm/util.c:403
RSP: 0018:ffff8801d34876e8 EFLAGS: 00010293
RAX: ffff8801bdd5e440 RBX: 0000000001088220 RCX: ffffffff81970ca3
RDX: 0000000000000000 RSI: 0000000001088220 RDI: 00000000000007a8
RBP: ffff8801d3487708 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000007a8
R13: 0000000000000000 R14: 00000000ffffffff R15: ffff8801d2243f00
 kvmalloc include/linux/mm.h:541 [inline]
 kvmalloc_array include/linux/mm.h:557 [inline]
 __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:474 [inline]
 ptr_ring_init include/linux/ptr_ring.h:492 [inline]
 __cpu_map_entry_alloc kernel/bpf/cpumap.c:359 [inline]
 cpu_map_update_elem+0x3c3/0x8e0 kernel/bpf/cpumap.c:490
 map_update_elem kernel/bpf/syscall.c:698 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1872 [inline]
 SyS_bpf+0x215f/0x4860 kernel/bpf/syscall.c:1843
 do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x26/0x9b
RIP: 0033:0x43fda9
RSP: 002b:00007ffe89f30e08 EFLAGS: 00000203 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 000000000043fda9
RDX: 0000000000000020 RSI: 000000002029d000 RDI: 0000000000000002
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004016d0
R13: 0000000000401760 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (2677):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/02/15 06:10 bpf-next 615a94749857 77ed06bf .config console log report syz C ci-upstream-bpf-next-kasan-gce
2018/02/21 02:10 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 02:09 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 02:06 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 02:04 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:58 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:57 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:53 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:41 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:35 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:33 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:24 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:23 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:23 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:23 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:16 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:15 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:10 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:09 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:07 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 01:01 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:54 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:54 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:53 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:51 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:50 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:38 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:34 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:32 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:30 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:23 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:23 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:21 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:20 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:15 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:08 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/21 00:05 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/20 23:57 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/20 23:50 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/20 23:50 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/20 23:46 bpf-next 0b6b8a3dd86d 04cbdbd1 .config console log report ci-upstream-bpf-next-kasan-gce
2018/02/15 05:57 bpf-next 615a94749857 77ed06bf .config console log report ci-upstream-bpf-next-kasan-gce
* Struck through repros no longer work on HEAD.