Hello,
syzbot found the following crash on:
HEAD commit: 2bdea157b999 Merge branch 'sctp-fully-support-for-dscp-and..
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=136a7e0c400000
kernel config: https://syzkaller.appspot.com/x/.config?x=f62553dc846b0692
dashboard link: https://syzkaller.appspot.com/bug?extid=6cea61a6cd1e9ae6b195
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email protected]
==================================================================
BUG: KASAN: stack-out-of-bounds in switch_mm_irqs_off+0x13db/0x16c0
arch/x86/mm/tlb.c:275
PANIC: double fault, error_code: 0x0
Read of size 8 at addr ffff8801957727f0 by task swapper/0/0
CPU: 1 PID: 6433 Comm: syz-executor2 Not tainted 4.18.0-rc3+ #45
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.18.0-rc3+ #45
RIP: 0010:__lock_acquire+0x2e/0x5020 kernel/locking/lockdep.c:3294
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Code:
Call Trace:
41 57
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
41
89 cf
41 56
41 55
49 89
print_address_description+0x6c/0x20b mm/kasan/report.c:256
fd
41
kasan_report_error mm/kasan/report.c:354 [inline]
kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
54
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
45
switch_mm_irqs_off+0x13db/0x16c0 arch/x86/mm/tlb.c:275
89 cc
53
65
4c
8b 34 25
40
ee
01 00
48
83
e4 f0
context_switch kernel/sched/core.c:2850 [inline]
__schedule+0x79c/0x1ed0 kernel/sched/core.c:3504
48 81
ec
60 03
00
00
48
8b
45 10
<89>
schedule_idle+0x45/0x80 kernel/sched/core.c:3575
94 24
do_idle+0x17f/0x570 kernel/sched/idle.c:286
80
00
00
cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368
00
48 ba
00
00
rest_init+0xe1/0xe4 init/main.c:442
00 00
start_kernel+0x90e/0x949 init/main.c:738
00
fc
ff df
48
89 84
24 98
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452
x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433
RSP: 0018:ffff880193f7eea0 EFLAGS: 00010086
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242
RAX: 0000000000000000 RBX: 1ffff100327efe50 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620
Allocated by task 4496:
RBP: ffff880193f7f228 R08: 0000000000000000 R09: 0000000000000000
save_stack+0x43/0xd0 mm/kasan/kasan.c:448
R10: ffff880195aa71b8 R11: ffff8801daf236b3 R12: 0000000000000000
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
R13: ffffffff88f92620 R14: ffff8801aa290440 R15: 0000000000000002
kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
FS: 00007f39fda9b700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
dup_mm kernel/fork.c:1234 [inline]
copy_mm kernel/fork.c:1297 [inline]
copy_process.part.40+0x235f/0x7220 kernel/fork.c:1803
CR2: ffff880193f7ee98 CR3: 00000001d6d6a000 CR4: 00000000001406e0
copy_process kernel/fork.c:1616 [inline]
_do_fork+0x291/0x12a0 kernel/fork.c:2099
DR0: 00000000200001c0 DR1: 0000000020000000 DR2: 0000000000000000
__do_sys_clone kernel/fork.c:2206 [inline]
__se_sys_clone kernel/fork.c:2200 [inline]
__x64_sys_clone+0xbf/0x150 kernel/fork.c:2200
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
---
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