* [syzbot] [ext4?] general protection fault in ep_poll_callback
@ 2023-07-20 11:38 syzbot
2023-07-21 9:30 ` syzbot
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2023-07-20 11:38 UTC (permalink / raw)
To: adilger.kernel, brauner, linux-ext4, linux-fsdevel, linux-kernel,
syzkaller-bugs, tytso, viro
Hello,
syzbot found the following issue on:
HEAD commit: bfa3037d8280 Merge tag 'fuse-update-6.5' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1533fa14a80000
kernel config: https://syzkaller.appspot.com/x/.config?x=27e33fd2346a54b
dashboard link: https://syzkaller.appspot.com/bug?extid=c2b68bdf76e442836443
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111c904ea80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116b0faaa80000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2869ea56e997/disk-bfa3037d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/06fd8fb45baf/vmlinux-bfa3037d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1c5715f42344/bzImage-bfa3037d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/96d1ec5db296/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c2b68bdf76e442836443@syzkaller.appspotmail.com
general protection fault, maybe for address 0xffffc90003e0fdc8: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4473 Comm: udevd Not tainted 6.5.0-rc2-syzkaller-00052-gbfa3037d8280 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
RIP: 0010:__wake_up_common+0x13c/0x5a0 kernel/sched/wait.c:107
Code: c6 04 75 6e 49 8d 78 10 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 1c 03 00 00 48 8b 4c 24 08 4c 89 c7 8b 54 24 10 8b 74 24 04 <41> ff 50 10 85 c0 78 2d 74 11 41 83 e6 01 74 0b 83 6c 24 14 01 0f
RSP: 0018:ffffc900031cf790 EFLAGS: 00010046
RAX: 1ffff920007c1fb9 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffc90003e0fdb8
RBP: ffff8880273470d0 R08: ffffc90003e0fdb8 R09: ffffc900031cf830
R10: 0000000000000003 R11: 0000000000094000 R12: ffffc900031cf830
R13: dffffc0000000000 R14: 00000000ffff8880 R15: 816f3352ffff8868
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000fffffffe CR3: 000000000c776000 CR4: 0000000000350ef0
Call Trace:
<TASK>
__wake_up_common_lock+0xd6/0x140 kernel/sched/wait.c:138
ep_poll_callback+0x316/0xc10 fs/eventpoll.c:1242
__wake_up_common+0x140/0x5a0 kernel/sched/wait.c:107
__wake_up_common_lock+0xd6/0x140 kernel/sched/wait.c:138
signalfd_notify include/linux/signalfd.h:22 [inline]
__send_signal_locked+0x94b/0x11d0 kernel/signal.c:1173
do_send_sig_info kernel/signal.c:1296 [inline]
group_send_sig_info+0x2ad/0x310 kernel/signal.c:1446
forget_original_parent kernel/exit.c:709 [inline]
exit_notify kernel/exit.c:734 [inline]
do_exit+0xd9d/0x2a20 kernel/exit.c:894
do_group_exit+0xd4/0x2a0 kernel/exit.c:1024
get_signal+0x23ea/0x2770 kernel/signal.c:2877
arch_do_signal_or_restart+0x89/0x5f0 arch/x86/kernel/signal.c:308
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8fae30e3cd
Code: Unable to access opcode bytes at 0x7f8fae30e3a3.
RSP: 002b:00007ffea9c17ff0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f8fae30e3cd
RDX: 0000000000000006 RSI: 0000000000001179 RDI: 0000000000001179
RBP: 0000000000001179 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000006
R13: 00007ffea9c18200 R14: 0000000000001000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__wake_up_common+0x13c/0x5a0 kernel/sched/wait.c:107
Code: c6 04 75 6e 49 8d 78 10 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 1c 03 00 00 48 8b 4c 24 08 4c 89 c7 8b 54 24 10 8b 74 24 04 <41> ff 50 10 85 c0 78 2d 74 11 41 83 e6 01 74 0b 83 6c 24 14 01 0f
RSP: 0018:ffffc900031cf790 EFLAGS: 00010046
RAX: 1ffff920007c1fb9 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffc90003e0fdb8
RBP: ffff8880273470d0 R08: ffffc90003e0fdb8 R09: ffffc900031cf830
R10: 0000000000000003 R11: 0000000000094000 R12: ffffc900031cf830
R13: dffffc0000000000 R14: 00000000ffff8880 R15: 816f3352ffff8868
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000fffffffe CR3: 000000000c776000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: c6 04 75 6e 49 8d 78 movb $0x10,0x788d496e(,%rsi,2)
7: 10
8: 48 89 f8 mov %rdi,%rax
b: 48 c1 e8 03 shr $0x3,%rax
f: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
14: 0f 85 1c 03 00 00 jne 0x336
1a: 48 8b 4c 24 08 mov 0x8(%rsp),%rcx
1f: 4c 89 c7 mov %r8,%rdi
22: 8b 54 24 10 mov 0x10(%rsp),%edx
26: 8b 74 24 04 mov 0x4(%rsp),%esi
* 2a: 41 ff 50 10 call *0x10(%r8) <-- trapping instruction
2e: 85 c0 test %eax,%eax
30: 78 2d js 0x5f
32: 74 11 je 0x45
34: 41 83 e6 01 and $0x1,%r14d
38: 74 0b je 0x45
3a: 83 6c 24 14 01 subl $0x1,0x14(%rsp)
3f: 0f .byte 0xf
---
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [ext4?] general protection fault in ep_poll_callback
2023-07-20 11:38 [syzbot] [ext4?] general protection fault in ep_poll_callback syzbot
@ 2023-07-21 9:30 ` syzbot
2023-07-21 9:47 ` Aleksandr Nogikh
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2023-07-21 9:30 UTC (permalink / raw)
To: adilger.kernel, brauner, bvanassche, linux-ext4, linux-fsdevel,
linux-kernel, mingo, peterz, syzkaller-bugs, tytso, viro
syzbot has bisected this issue to:
commit a0b0fd53e1e67639b303b15939b9c653dbe7a8c4
Author: Bart Van Assche <bvanassche@acm.org>
Date: Thu Feb 14 23:00:46 2019 +0000
locking/lockdep: Free lock classes that are no longer in use
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16c0c84ea80000
start commit: bfa3037d8280 Merge tag 'fuse-update-6.5' of git://git.kern..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=15c0c84ea80000
console output: https://syzkaller.appspot.com/x/log.txt?x=11c0c84ea80000
kernel config: https://syzkaller.appspot.com/x/.config?x=27e33fd2346a54b
dashboard link: https://syzkaller.appspot.com/bug?extid=c2b68bdf76e442836443
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111c904ea80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116b0faaa80000
Reported-by: syzbot+c2b68bdf76e442836443@syzkaller.appspotmail.com
Fixes: a0b0fd53e1e6 ("locking/lockdep: Free lock classes that are no longer in use")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [ext4?] general protection fault in ep_poll_callback
2023-07-21 9:30 ` syzbot
@ 2023-07-21 9:47 ` Aleksandr Nogikh
0 siblings, 0 replies; 3+ messages in thread
From: Aleksandr Nogikh @ 2023-07-21 9:47 UTC (permalink / raw)
To: syzbot
Cc: adilger.kernel, brauner, bvanassche, linux-ext4, linux-fsdevel,
linux-kernel, mingo, peterz, syzkaller-bugs, tytso, viro,
Dmitry Vyukov
On Fri, Jul 21, 2023 at 11:30 AM syzbot
<syzbot+c2b68bdf76e442836443@syzkaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit a0b0fd53e1e67639b303b15939b9c653dbe7a8c4
> Author: Bart Van Assche <bvanassche@acm.org>
> Date: Thu Feb 14 23:00:46 2019 +0000
>
> locking/lockdep: Free lock classes that are no longer in use
No, that doesn't seem like a real cause commit.
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16c0c84ea80000
The reproducer actually causes a lot of different crashes, which
apparently confused the bisector.
run #0: crashed: general protection fault in ext4_finish_bio
run #1: crashed: general protection fault in ext4_finish_bio
run #2: crashed: KASAN: wild-memory-access Read in force_sig_info_to_task
run #3: crashed: KASAN: wild-memory-access Read in force_sig_info_to_task
run #4: crashed: BUG: unable to handle kernel paging request in __run_timers
run #5: crashed: BUG: unable to handle kernel paging request in __run_timers
run #6: crashed: general protection fault in mac80211_hwsim_netlink_notify
run #7: crashed: general protection fault in mac80211_hwsim_netlink_notify
run #8: crashed: general protection fault in __run_timers
run #9: crashed: general protection fault in __run_timers
run #10: crashed: KASAN: wild-memory-access Read in process_one_work
run #11: crashed: KASAN: wild-memory-access Read in process_one_work
run #12: crashed: general protection fault in timerqueue_del
run #13: crashed: general protection fault in timerqueue_del
run #14: crashed: kernel BUG in corrupted
run #15: crashed: kernel BUG in corrupted
run #16: crashed: general protection fault in mm_update_next_owner
run #17: crashed: general protection fault in mm_update_next_owner
Isn't it a sign of a severe memory corruption caused by the reproducer?
> start commit: bfa3037d8280 Merge tag 'fuse-update-6.5' of git://git.kern..
> git tree: upstream
> final oops: https://syzkaller.appspot.com/x/report.txt?x=15c0c84ea80000
> console output: https://syzkaller.appspot.com/x/log.txt?x=11c0c84ea80000
> kernel config: https://syzkaller.appspot.com/x/.config?x=27e33fd2346a54b
> dashboard link: https://syzkaller.appspot.com/bug?extid=c2b68bdf76e442836443
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111c904ea80000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=116b0faaa80000
>
> Reported-by: syzbot+c2b68bdf76e442836443@syzkaller.appspotmail.com
> Fixes: a0b0fd53e1e6 ("locking/lockdep: Free lock classes that are no longer in use")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-07-21 9:48 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2023-07-20 11:38 [syzbot] [ext4?] general protection fault in ep_poll_callback syzbot
2023-07-21 9:30 ` syzbot
2023-07-21 9:47 ` Aleksandr Nogikh
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