BUG: unable to handle kernel paging request in bpf_trace_run6

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 80d830d7 UPSTREAM: udp: initialize is_flist with 0 in udp_..
git tree: android-5.4
console output: https://syzkaller.appspot.com/x/log.txt?x=10c4ce0d900000
kernel config: https://syzkaller.appspot.com/x/.config?x=cfb1b86f84d1d53d
dashboard link: https://syzkaller.appspot.com/bug?extid=f4269450e371939565fe
compiler: Android (6032204 based on r370808) clang version 10.0.1 (https://android.googlesource.com/toolchain/llvm-project 6e765c10313d15c02ab29977a82938f66742c3a9)

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f42694...@syzkaller.appspotmail.com

BUG: unable to handle page fault for address: ffffc90000055030
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 1da89e067 P4D 1da89e067 PUD 1da89f067 PMD 1da8a4067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 368 Comm: syz-executor.2 Tainted: G W 5.4.63-syzkaller-00006-g80d830d79a4d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bpf_call_func include/linux/filter.h:608 [inline]
RIP: 0010:__bpf_trace_run kernel/trace/bpf_trace.c:1334 [inline]
RIP: 0010:bpf_trace_run6+0x193/0x300 kernel/trace/bpf_trace.c:1376
Code: 7e 01 0f 1f 44 00 00 e8 db 08 f9 ff 49 8d 7d 30 48 89 f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 d4 bc 26 00 49 8d 75 38 4c 89 f7 <41> ff 55 30 e9 db 00 00 00 e8 af 08 f9 ff e8 fa 24 bf ff 4c 89 e1
RSP: 0018:ffff88819546f7c0 EFLAGS: 00010246
RAX: 1ffff9200000aa06 RBX: 0000000000000000 RCX: ffff8881ce388000
RDX: 0000000000000000 RSI: ffffc90000055038 RDI: ffff88819546f800
RBP: ffff88819546f8c0 R08: 0000000000000000 R09: ffff88819546fa40
R10: fffffbfff09b25a5 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffc90000055000 R14: ffff88819546f800 R15: 1ffff11032a8defc
FS: 0000000002e54940(0000) GS:ffff8881db800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000055030 CR3: 0000000195460005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__bpf_trace_ext4_ext_remove_space_done+0x3f/0x50 include/trace/events/ext4.h:2202
trace_ext4_ext_remove_space_done include/trace/events/ext4.h:2202 [inline]
ext4_ext_remove_space+0x1496/0x26b0 fs/ext4/extents.c:3156
ext4_truncate+0xc6c/0x1250 fs/ext4/inode.c:4591
ext4_evict_inode+0x14ff/0x1a70 fs/ext4/inode.c:299
evict+0x29b/0x6a0 fs/inode.c:576
vfs_rmdir2+0x1cf/0x3f0 fs/namei.c:4017
do_rmdir+0x2cb/0x600 fs/namei.c:4071
do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d327
Code: 00 66 90 b8 57 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 54 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 bd b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffcf2c95ed8 EFLAGS: 00000207 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 000000000045d327
RDX: 0000000000000000 RSI: 000000000074a678 RDI: 00007ffcf2c97010
RBP: 00000000000009a1 R08: 0000000000000000 R09: 0000000000000001
R10: 000000000000000a R11: 0000000000000207 R12: 00007ffcf2c97010
R13: 0000000002e55940 R14: 0000000000000000 R15: 00007ffcf2c97010
Modules linked in:
CR2: ffffc90000055030
---[ end trace 689fbf4bae543b16 ]---
RIP: 0010:bpf_call_func include/linux/filter.h:608 [inline]
RIP: 0010:__bpf_trace_run kernel/trace/bpf_trace.c:1334 [inline]
RIP: 0010:bpf_trace_run6+0x193/0x300 kernel/trace/bpf_trace.c:1376
Code: 7e 01 0f 1f 44 00 00 e8 db 08 f9 ff 49 8d 7d 30 48 89 f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 d4 bc 26 00 49 8d 75 38 4c 89 f7 <41> ff 55 30 e9 db 00 00 00 e8 af 08 f9 ff e8 fa 24 bf ff 4c 89 e1
RSP: 0018:ffff88819546f7c0 EFLAGS: 00010246
RAX: 1ffff9200000aa06 RBX: 0000000000000000 RCX: ffff8881ce388000
RDX: 0000000000000000 RSI: ffffc90000055038 RDI: ffff88819546f800
RBP: ffff88819546f8c0 R08: 0000000000000000 R09: ffff88819546fa40
R10: fffffbfff09b25a5 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffc90000055000 R14: ffff88819546f800 R15: 1ffff11032a8defc
FS: 0000000002e54940(0000) GS:ffff8881db800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90000055030 CR3: 0000000195460005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.