Hello,
syzbot found the following crash on:
HEAD commit: aea0a897af9e ptp: Fix pass zero to ERR_PTR() in ptp_clock_..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=101b91d5400000
kernel config: https://syzkaller.appspot.com/x/.config?x=c36a72af2123e78a
dashboard link: https://syzkaller.appspot.com/bug?extid=d89b30c46434c433dbf8
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=170f6a47400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12e1df7b400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d89b30c46434c433dbf8@xxxxxxxxxxxxxxxxxxxxxxxxx
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DEBUG_LOCKS_WARN_ON(!hlock->nest_lock)
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Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected
to SLAB object 'task_struct' (offset 1432, size 2)!
WARNING: CPU: 1 PID: 38 at mm/usercopy.c:83 usercopy_warn+0xee/0x110
mm/usercopy.c:78
Kernel panic - not syncing: panic_on_warn set ...
list_add corruption. next->prev should be prev (ffff8881daf2d798), but was
0b7e0c8e49cc0400. (next=ffff8881d9b4a4f0).
CPU: 1 PID: 38 Comm: ���ف���d ������ Not tainted 4.20.0-rc3+ #312
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Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
kernel BUG at lib/list_debug.c:25!
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invalid opcode: 0000 [#1] PREEMPT SMP KASAN
kernel BUG at mm/slab.c:4425!
CPU: 0 PID: 8652 Comm: syz-executor607 Not tainted 4.20.0-rc3+ #312
WARNING: CPU: 1 PID: 38 at kernel/rcu/tree_plugin.h:438
__rcu_read_unlock+0x266/0x2e0 kernel/rcu/tree_plugin.h:432
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Modules linked in:
RIP: 0010:__list_add_valid.cold.2+0xf/0x2a lib/list_debug.c:23
CPU: 1 PID: 38 Comm: ���ف���d ������ Not tainted 4.20.0-rc3+ #312
Code: d1 60 88 e8 a1 37 d2 fd 0f 0b 48 89 de 48 c7 c7 60 d1 60 88 e8 90 37
d2 fd 0f 0b 48 89 d9 48 c7 c7 20 d2 60 88 e8 7f 37 d2 fd <0f> 0b 48 89 f1
48 c7 c7 a0 d2 60 88 48 89 de e8 6b 37 d2 fd 0f 0b
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RSP: 0000:ffff8881dae07588 EFLAGS: 00010082
usercopy: Kernel memory overwrite attempt detected to SLAB
object 'signal_cache' (offset 1328, size 23)!
RAX: 0000000000000075 RBX: ffff8881d9b4a4f0 RCX: 0000000000000000
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RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005
kernel BUG at mm/usercopy.c:102!
RBP: ffff8881dae075a0 R08: ffff8881d25ce100 R09: ffffed103b5c5020
R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881bd890230
R13: dffffc0000000000 R14: ffff8881dae07980 R15: ffff8881daf2d798
FS: 000000000083c880(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff14476600 CR3: 00000001d2a59000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
__list_add include/linux/list.h:60 [inline]
list_add include/linux/list.h:79 [inline]
list_move include/linux/list.h:171 [inline]
detach_tasks kernel/sched/fair.c:7298 [inline]
load_balance+0x1b8d/0x39a0 kernel/sched/fair.c:8731
rebalance_domains+0x845/0xdc0 kernel/sched/fair.c:9109
run_rebalance_domains+0x38d/0x500 kernel/sched/fair.c:9731
__do_softirq+0x308/0xb7e kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x17f/0x1c0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1061
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804
</IRQ>
RIP: 0033:0x4005dd
Code: c9 00 04 00 66 0f 1f 84 00 00 00 00 00 48 8b 05 f1 2e 2d 00 48 85 c0
74 11 bf 3c e8 4b 00 b9 0e 00 00 00 48 89 c6 f3 a6 75 01 <c3> 48 89 c7 e9
9a ec 01 00 66 2e 0f 1f 84 00 00 00 00 00 8b 05 4a
RSP: 002b:00007fff144765a8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 00000000006d2190
RDX: 0000000000402410 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006cc0a8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d2180 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace eeb5734c13709e17 ]---
invalid opcode: 0000 [#2] PREEMPT SMP KASAN
CPU: 1 PID: 38 Comm: ���ف���d ������ Tainted: G D
4.20.0-rc3+ #312
RIP: 0010:__list_add_valid.cold.2+0xf/0x2a lib/list_debug.c:23
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Code: d1 60 88 e8 a1 37 d2 fd 0f 0b 48 89 de 48 c7 c7 60 d1 60 88 e8 90 37
d2 fd 0f 0b 48 89 d9 48 c7 c7 20 d2 60 88 e8 7f 37 d2 fd <0f> 0b 48 89 f1
48 c7 c7 a0 d2 60 88 48 89 de e8 6b 37 d2 fd 0f 0b
RIP: 0010:usercopy_abort+0xbb/0xbd mm/usercopy.c:90
RSP: 0000:ffff8881dae07588 EFLAGS: 00010082
Code: c0 e8 f7 dc b1 ff 48 8b 55 c0 49 89 d9 4d 89 f0 ff 75 c8 4c 89 e1 4c
89 ee 48 c7 c7 80 d5 34 88 ff 75 d0 41 57 e8 e7 28 98 ff <0f> 0b e8 cc dc
b1 ff e8 97 13 f5 ff 8b 95 e4 fe ff ff 4c 89 e1 31
RAX: 0000000000000075 RBX: ffff8881d9b4a4f0 RCX: 0000000000000000
RSP: 0018:ffff8881d9b49438 EFLAGS: 00010086
RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005
RAX: 0000000000000068 RBX: ffffffff88291020 RCX: 0000000000000000
RBP: ffff8881dae075a0 R08: ffff8881d25ce100 R09: ffffed103b5c5020
RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005
R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881bd890230
RBP: ffff8881d9b49490 R08: ffff8881d9b4a440 R09: ffffed103b5e3ef8
R13: dffffc0000000000 R14: ffff8881dae07980 R15: ffff8881daf2d798
R10: ffffed103b5e3ef8 R11: ffff8881daf1f7c7 R12: ffffffff8914da1d
FS: 000000000083c880(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
R13: ffffffff8834d3e0 R14: ffffffff8834d320 R15: ffffffff8834d2e0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
FS: 0000000000000000(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CR2: 00007fff14476600 CR3: 00000001d2a59000 CR4: 00000000001406f0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
CR2: 0000000000000130 CR3: 00000001d7880000 CR4: 00000000001406e0
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
---[ end trace eeb5734c13709e18 ]---
RIP: 0010:__list_add_valid.cold.2+0xf/0x2a lib/list_debug.c:23
Code: d1 60 88 e8 a1 37 d2 fd 0f 0b 48 89 de 48 c7 c7 60 d1 60 88 e8 90 37
d2 fd 0f 0b 48 89 d9 48 c7 c7 20 d2 60 88 e8 7f 37 d2 fd <0f> 0b 48 89 f1
48 c7 c7 a0 d2 60 88 48 89 de e8 6b 37 d2 fd 0f 0b
RSP: 0000:ffff8881dae07588 EFLAGS: 00010082
RAX: 0000000000000075 RBX: ffff8881d9b4a4f0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005
RBP: ffff8881dae075a0 R08: ffff8881d25ce100 R09: ffffed103b5c5020
R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881bd890230
R13: dffffc0000000000 R14: ffff8881dae07980 R15: ffff8881daf2d798
FS: 0000000000000000(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000130 CR3: 00000001d7880000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
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