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Message-ID: <875yvbf23g.ffs@tglx>
Date: Wed, 08 Sep 2021 18:45:23 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: syzbot <syzbot+b935db3fe409625cca1b@...kaller.appspotmail.com>,
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
io-uring@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Subject: Re: [syzbot] general protection fault in hrtimer_start_range_ns
On Mon, Sep 06 2021 at 03:28, syzbot wrote:
> syzbot found the following issue on:
>
> HEAD commit: 835d31d319d9 Merge tag 'media/v5.15-1' of git://git.kernel..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=14489886300000
> kernel config: https://syzkaller.appspot.com/x/.config?x=d793523866f2daea
> dashboard link: https://syzkaller.appspot.com/bug?extid=b935db3fe409625cca1b
> compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1
>
> 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+b935db3fe409625cca1b@...kaller.appspotmail.com
>
> general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
> CPU: 0 PID: 12936 Comm: iou-sqp-12929 Not tainted 5.14.0-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:lock_hrtimer_base kernel/time/hrtimer.c:173 [inline]
That's almost certainly deferencing hrtimer->base and as that is NULL this looks
like a not initialized hrtimer.
Jens?
> RIP: 0010:hrtimer_start_range_ns+0xc9/0x1ae0 kernel/time/hrtimer.c:1296
> Code: 89 9c 24 88 00 00 00 42 80 3c 33 00 74 08 48 89 ef e8 7b 34 5b 00 4c 8b 6d 00 4d 39 fd 0f 84 95 00 00 00 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 58 34 5b 00 49 8b 7d 00 e8 6f 19
> RSP: 0018:ffffc900097af170 EFLAGS: 00010046
> RAX: ffff888016d49508 RBX: 1ffff11002da92a7 RCX: ffff888027371c80
> RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
> RBP: ffff888016d49538 R08: ffffffff816fb4b5 R09: 0000000000000003
> R10: fffff520012f5e2d R11: 0000000000000004 R12: 0000000000000000
> R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
> FS: 00007f7386f28700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 000000002b5e4000 CR4: 00000000001526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> hrtimer_start include/linux/hrtimer.h:418 [inline]
> io_timeout fs/io_uring.c:6120 [inline]
> io_issue_sqe+0x53d3/0x9280 fs/io_uring.c:6590
> __io_queue_sqe+0xe3/0x1000 fs/io_uring.c:6864
> tctx_task_work+0x2ad/0x560 fs/io_uring.c:2143
> task_work_run+0x146/0x1c0 kernel/task_work.c:164
> tracehook_notify_signal include/linux/tracehook.h:212 [inline]
> io_run_task_work+0x110/0x140 fs/io_uring.c:2403
> io_sq_thread+0xb5e/0x1220 fs/io_uring.c:7337
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
> Modules linked in:
> ---[ end trace 841fafb7511d53d3 ]---
> RIP: 0010:lock_hrtimer_base kernel/time/hrtimer.c:173 [inline]
> RIP: 0010:hrtimer_start_range_ns+0xc9/0x1ae0 kernel/time/hrtimer.c:1296
> Code: 89 9c 24 88 00 00 00 42 80 3c 33 00 74 08 48 89 ef e8 7b 34 5b 00 4c 8b 6d 00 4d 39 fd 0f 84 95 00 00 00 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 58 34 5b 00 49 8b 7d 00 e8 6f 19
> RSP: 0018:ffffc900097af170 EFLAGS: 00010046
> RAX: ffff888016d49508 RBX: 1ffff11002da92a7 RCX: ffff888027371c80
> RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
> RBP: ffff888016d49538 R08: ffffffff816fb4b5 R09: 0000000000000003
> R10: fffff520012f5e2d R11: 0000000000000004 R12: 0000000000000000
> R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
> FS: 00007f7386f28700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 000000002b5e4000 CR4: 00000000001526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> ----------------
> Code disassembly (best guess):
> 0: 89 9c 24 88 00 00 00 mov %ebx,0x88(%rsp)
> 7: 42 80 3c 33 00 cmpb $0x0,(%rbx,%r14,1)
> c: 74 08 je 0x16
> e: 48 89 ef mov %rbp,%rdi
> 11: e8 7b 34 5b 00 callq 0x5b3491
> 16: 4c 8b 6d 00 mov 0x0(%rbp),%r13
> 1a: 4d 39 fd cmp %r15,%r13
> 1d: 0f 84 95 00 00 00 je 0xb8
> 23: 4d 89 ef mov %r13,%r15
> 26: 49 c1 ef 03 shr $0x3,%r15
> * 2a: 43 80 3c 37 00 cmpb $0x0,(%r15,%r14,1) <-- trapping instruction
> 2f: 74 08 je 0x39
> 31: 4c 89 ef mov %r13,%rdi
> 34: e8 58 34 5b 00 callq 0x5b3491
> 39: 49 8b 7d 00 mov 0x0(%r13),%rdi
> 3d: e8 .byte 0xe8
> 3e: 6f outsl %ds:(%rsi),(%dx)
> 3f: 19 .byte 0x19
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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