Message-ID: <CAKG+3NT_v6fVOOn-qftVTLTHg5kSgsfnwb_-+zAQ-3drJm5+=A@mail.gmail.com>
Date:   Wed, 5 Jan 2022 23:54:16 +0800
From:   "Sabri N. Ferreiro" <snferreiro1@...il.com>
To:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org
Cc:     mosesfonscqf75@...il.com
Subject: INFO: rcu detected stall in devkmsg_read

Hi,

When using Syzkaller to fuzz the Linux kernel, it triggers the following crash.

HEAD commit: a7904a538933 Linux 5.16-rc6
git tree: upstream
console output: https://paste.ubuntu.com/p/mdfS9m5C74/
kernel config: https://docs.google.com/document/d/1w94kqQ4ZSIE6BW-5WIhqp4_Zh7XTPH57L5OF2Xb6O6o/view

If you fix this issue, please add the following tag to the commit:
Reported-by:  Yuheng Shen <mosesfonscqf75@...il.com>

Sorry for my lack of this crash reproducer, I hope the symbolic report
will help you.

R13: 00007ffd0a4a0e08 R14: 000055d71ee2c958 R15: 0005d4cd3d2ed07c
 </TASK>
Call Trace:
 <IRQ>
 x86_pmu_stop+0x11b/0x320 root/fuzz/kernel/5.16/arch/x86/events/core.c:1597
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
 x86_pmu_del+0x1a5/0x5b0 root/fuzz/kernel/5.16/arch/x86/events/core.c:1636
rcu: 1-....: (108 ticks this GP) idle=459/1/0x4000000000000000
softirq=39414/39414 fqs=4592
(detected by 3, t=21002 jiffies, g=40973, q=19739)
 event_sched_out.part.0+0x1ea/0x820
root/fuzz/kernel/5.16/kernel/events/core.c:2285
Sending NMI from CPU 3 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 121 Comm: systemd-journal Not tainted 5.16.0-rc6 #3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
RIP: 0010:preempt_count_add+0x7/0x140
root/fuzz/kernel/5.16/kernel/sched/core.c:5422
Code: df 03 00 48 89 ef e8 68 81 04 00 48 8b 3d b1 ca b8 03 48 89 ee
5d e9 a8 2b 44 00 0f 1f 84 00 00 00 00 00 48 c7 c0 c0 ef 6d 92 <55> 48
ba 00 00 00 00 00 fc ff df 48 89 c1 53 83 e0 07 89 fb 48 c1
RSP: 0018:ffff8881f7289868 EFLAGS: 00000046
RAX: ffffffff926defc0 RBX: 1ffff1103ee5130e RCX: ffffffff8e253c25
RDX: ffff8881082bd3c0 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffffff9269e980 R08: 0000000000000001 R09: ffffffff9269e30e
R10: fffffbfff24d3c61 R11: 0000000000000001 R12: ffff8881f7289940
R13: 0000000000014f2e R14: 0000000000014f2e R15: ffff8881f7289ad0
FS:  00007f3f4e83c8c0(0000) GS:ffff8881f7280000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3f4a04b000 CR3: 0000000108138000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_lock
root/fuzz/kernel/5.16/./include/linux/spinlock_api_smp.h:132 [inline]
 _raw_spin_lock+0x5e/0xd0 root/fuzz/kernel/5.16/kernel/locking/spinlock.c:154
 console_lock_spinning_enable
root/fuzz/kernel/5.16/kernel/printk/printk.c:1776 [inline]
 console_unlock+0x28e/0x8e0 root/fuzz/kernel/5.16/kernel/printk/printk.c:2708
 vprintk_emit+0xf8/0x230 root/fuzz/kernel/5.16/kernel/printk/printk.c:2245
 vprintk+0x69/0x80 root/fuzz/kernel/5.16/kernel/printk/printk_safe.c:50
 _printk+0xba/0xed root/fuzz/kernel/5.16/kernel/printk/printk.c:2266
 printk_stack_address
root/fuzz/kernel/5.16/arch/x86/kernel/dumpstack.c:72 [inline]
 show_trace_log_lvl+0x263/0x2ca
root/fuzz/kernel/5.16/arch/x86/kernel/dumpstack.c:282
 ex_handler_wrmsr_unsafe root/fuzz/kernel/5.16/arch/x86/mm/extable.c:87 [inline]
 fixup_exception+0x3bb/0x690 root/fuzz/kernel/5.16/arch/x86/mm/extable.c:150
 __exc_general_protection
root/fuzz/kernel/5.16/arch/x86/kernel/traps.c:601 [inline]
 exc_general_protection+0xed/0x2e0
root/fuzz/kernel/5.16/arch/x86/kernel/traps.c:562
 asm_exc_general_protection+0x1e/0x30
root/fuzz/kernel/5.16/./arch/x86/include/asm/idtentry.h:562
RIP: 0010:__wrmsr
root/fuzz/kernel/5.16/./arch/x86/include/asm/msr.h:103 [inline]
RIP: 0010:native_write_msr
root/fuzz/kernel/5.16/./arch/x86/include/asm/msr.h:160 [inline]
RIP: 0010:wrmsrl root/fuzz/kernel/5.16/./arch/x86/include/asm/msr.h:281 [inline]
RIP: 0010:x86_pmu_disable_event
root/fuzz/kernel/5.16/arch/x86/events/amd/../perf_event.h:1138
[inline]
RIP: 0010:amd_pmu_disable_event+0x83/0x280
root/fuzz/kernel/5.16/arch/x86/events/amd/core.c:639
Code: 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e0 01
00 00 48 8b ab 78 01 00 00 4c 89 e2 44 89 e0 48 c1 ea 20 89 e9 <0f> 30
66 90 e8 34 4a 38 00 e8 2f 4a 38 00 48 8d bb 94 01 00 00 48
RSP: 0018:ffff8881f7289df8 EFLAGS: 00010016
RAX: 0000000000110076 RBX: ffff88810e915c88 RCX: 00000000c0010200
RDX: 0000000000000100 RSI: ffffffff90e07480 RDI: ffff88810e915e00
RBP: 00000000c0010200 R08: 0000000000000000 R09: ffff8881f72a19e7
R10: ffffed103ee5433c R11: 0000000000000001 R12: 0000010000110076
R13: 0000000000000000 R14: ffff8881f72a17e0 R15: ffff88810e915e14
 x86_pmu_stop+0x11b/0x320 root/fuzz/kernel/5.16/arch/x86/events/core.c:1597
 x86_pmu_del+0x1a5/0x5b0 root/fuzz/kernel/5.16/arch/x86/events/core.c:1636
 event_sched_out.part.0+0x1ea/0x820
root/fuzz/kernel/5.16/kernel/events/core.c:2285
 event_sched_out root/fuzz/kernel/5.16/kernel/events/core.c:2354 [inline]
 __perf_remove_from_context+0x5c6/0x750
root/fuzz/kernel/5.16/kernel/events/core.c:2352
 event_function+0x216/0x310 root/fuzz/kernel/5.16/kernel/events/core.c:253
 remote_function root/fuzz/kernel/5.16/kernel/events/core.c:91 [inline]
 remote_function+0x110/0x190 root/fuzz/kernel/5.16/kernel/events/core.c:71
 flush_smp_call_function_queue+0x162/0x4f0
root/fuzz/kernel/5.16/kernel/smp.c:628
 __sysvec_call_function_single+0x62/0x200
root/fuzz/kernel/5.16/arch/x86/kernel/smp.c:248
 sysvec_call_function_single+0x89/0xc0
root/fuzz/kernel/5.16/arch/x86/kernel/smp.c:243
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x12/0x20
root/fuzz/kernel/5.16/./arch/x86/include/asm/idtentry.h:646
RIP: 0010:bytes_is_nonzero root/fuzz/kernel/5.16/mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero
root/fuzz/kernel/5.16/mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n
root/fuzz/kernel/5.16/mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned
root/fuzz/kernel/5.16/mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline
root/fuzz/kernel/5.16/mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x18e/0x1e0
root/fuzz/kernel/5.16/mm/kasan/generic.c:189
Code: 07 48 39 d0 7d 87 41 bb 01 00 00 00 5b 5d 44 89 d8 41 5c c3 48
85 d2 74 ed 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 df 80 38 00 <74> f2
e9 32 ff ff ff 41 bb 01 00 00 00 44 89 d8 c3 48 29 c3 48 89
RSP: 0018:ffff888108c07b68 EFLAGS: 00000246
RAX: fffffbfff22dc768 RBX: fffffbfff22dc769 RCX: ffffffff8e254b5c
RDX: fffffbfff22dc769 RSI: 0000000000000008 RDI: ffffffff916e3b40
RBP: fffffbfff22dc768 R08: 0000000000000000 R09: ffffffff916e3b47
R10: fffffbfff22dc768 R11: 0000000000000001 R12: ffffffff916e3b40
R13: ffff888108c07c30 R14: ffff888108c07c50 R15: ffffffff916e3b20
 instrument_atomic_read
root/fuzz/kernel/5.16/./include/linux/instrumented.h:71 [inline]
 atomic_long_read
root/fuzz/kernel/5.16/./include/linux/atomic/atomic-instrumented.h:1183
[inline]
 prb_first_seq root/fuzz/kernel/5.16/kernel/printk/printk_ringbuffer.c:1833
[inline]
 _prb_read_valid+0x48c/0x660
root/fuzz/kernel/5.16/kernel/printk/printk_ringbuffer.c:1881
 prb_read_valid+0x75/0xa0
root/fuzz/kernel/5.16/kernel/printk/printk_ringbuffer.c:1929
 devkmsg_read+0x158/0x680 root/fuzz/kernel/5.16/kernel/printk/printk.c:730
 vfs_read+0x13c/0x4c0 root/fuzz/kernel/5.16/fs/read_write.c:479
 ksys_read+0x100/0x210 root/fuzz/kernel/5.16/fs/read_write.c:619
 do_syscall_x64 root/fuzz/kernel/5.16/arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0x90 root/fuzz/kernel/5.16/arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3f4ddcd210
Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66
0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d
01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24
RSP: 002b:00007ffd0a49e438 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007ffd0a4a0eb0 RCX: 00007f3f4ddcd210
RDX: 0000000000002000 RSI: 00007ffd0a49ecb0 RDI: 0000000000000009
RBP: 0000000000000000 R08: 000000000000e000 R09: 0000000000000007
R10: 0000000000000002 R11: 0000000000000246 R12: 00007ffd0a49ecb0
R13: 00007ffd0a4a0e08 R14: 000055d71ee2c958 R15: 0005d4cd3d2ed07c
 </TASK>
 event_sched_out root/fuzz/kernel/5.16/kernel/events/core.c:2354 [inline]
 __perf_remove_from_context+0x5c6/0x750
root/fuzz/kernel/5.16/kernel/events/core.c:2352
 event_function+0x216/0x310 root/fuzz/kernel/5.16/kernel/events/core.c:253
 remote_function root/fuzz/kernel/5.16/kernel/events/core.c:91 [inline]
 remote_function+0x110/0x190 root/fuzz/kernel/5.16/kernel/events/core.c:71
 flush_smp_call_function_queue+0x162/0x4f0
root/fuzz/kernel/5.16/kernel/smp.c:628
 __sysvec_call_function_single+0x62/0x200
root/fuzz/kernel/5.16/arch/x86/kernel/smp.c:248
 sysvec_call_function_single+0x89/0xc0
root/fuzz/kernel/5.16/arch/x86/kernel/smp.c:243
 </IRQ>

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