Message-ID: <66e96979.050a0220.252d9a.000a.GAE@google.com>
Date: Tue, 17 Sep 2024 04:35:21 -0700
From: syzbot <syzbot+8bb3e2bee8a429cc76dd@...kaller.appspotmail.com>
To: Liam.Howlett@...cle.com, akpm@...ux-foundation.org, bp@...en8.de, 
	davem@...emloft.net, hpa@...or.com, jhs@...atatu.com, jiri@...nulli.us, 
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	lorenzo.stoakes@...cle.com, mingo@...hat.com, netdev@...r.kernel.org, 
	pbonzini@...hat.com, rkrcmar@...hat.com, syzkaller-bugs@...glegroups.com, 
	tglx@...utronix.de, vbabka@...e.cz, vinicius.gomes@...el.com, x86@...nel.org, 
	xiyou.wangcong@...il.com
Subject: [syzbot] [mm?] INFO: rcu detected stall in sys_execve (6)

Hello,

syzbot found the following issue on:

HEAD commit:    46ae4d0a4897 Merge git://git.kernel.org/pub/scm/linux/kern..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=106a549f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3e10d80c64e440c0
dashboard link: https://syzkaller.appspot.com/bug?extid=8bb3e2bee8a429cc76dd
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=144e27c7980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c16ef5753326/disk-46ae4d0a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4a3a038d0ccf/vmlinux-46ae4d0a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/244ada956332/bzImage-46ae4d0a.xz

The issue was bisected to:

commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22
Author: Vinicius Costa Gomes <vinicius.gomes@...el.com>
Date:   Sat Sep 29 00:59:43 2018 +0000

    tc: Add support for configuring the taprio scheduler

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10311900580000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=12311900580000
console output: https://syzkaller.appspot.com/x/log.txt?x=14311900580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8bb3e2bee8a429cc76dd@...kaller.appspotmail.com
Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")

rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-...D } 2685 jiffies s: 3289 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5444 Comm: syz-executor Not tainted 6.11.0-rc7-syzkaller-01396-g46ae4d0a4897 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:taprio_set_budgets+0x116/0x370 net/sched/sch_taprio.c:666
Code: 44 24 10 4c 89 74 24 18 4d 89 f5 45 31 ff 48 89 5c 24 08 bf 10 00 00 00 4c 89 fe e8 74 8f d2 f7 49 83 ff 0f 0f 87 63 01 00 00 <4c> 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74
RSP: 0018:ffffc90000007c30 EFLAGS: 00000093
RAX: 0000000000010000 RBX: ffff888028fdb130 RCX: ffff888030aada00
RDX: 0000000000010000 RSI: 0000000000000001 RDI: 0000000000000010
RBP: 0000000000000000 R08: ffffffff89c1021c R09: 1ffff110051cea10
R10: dffffc0000000000 R11: ffffed10051cea11 R12: 0000000000000004
R13: ffff888028e75008 R14: ffff888028e75000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb58963cff8 CR3: 00000000311f6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 advance_sched+0x98d/0xca0 net/sched/sch_taprio.c:977
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x59b/0xd50 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0x9/0x2a00 arch/x86/kernel/unwind_orc.c:469
Code: 4c 89 f7 e8 69 ad b9 00 e9 53 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 41 57 41 56 <41> 55 41 54 53 48 81 ec a0 00 00 00 48 89 fd 49 bd 00 00 00 00 00
RSP: 0018:ffffc9000422f120 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff820edaf2 RCX: ffff888030aada00
RDX: dffffc0000000000 RSI: ffffffff820edaf2 RDI: ffffc9000422f140
RBP: ffffc9000422f1d0 R08: 000000000000000a R09: ffffc9000422f230
R10: 0000000000000003 R11: ffffffff817f2f80 R12: ffff888030aada00
R13: ffffffff817f2f80 R14: ffffc9000422f220 R15: ffffc9000422f140
 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541
 __call_rcu_common kernel/rcu/tree.c:3106 [inline]
 call_rcu+0x167/0xa70 kernel/rcu/tree.c:3210
 remove_vma mm/mmap.c:189 [inline]
 remove_mt mm/mmap.c:2415 [inline]
 do_vmi_align_munmap+0x155c/0x18c0 mm/mmap.c:2758
 do_vmi_munmap+0x261/0x2f0 mm/mmap.c:2830
 __vm_munmap+0x1fc/0x400 mm/mmap.c:3109
 elf_map fs/binfmt_elf.c:383 [inline]
 elf_load+0x2d8/0x6f0 fs/binfmt_elf.c:408
 load_elf_binary+0xeba/0x2680 fs/binfmt_elf.c:1141
 search_binary_handler fs/exec.c:1827 [inline]
 exec_binprm fs/exec.c:1869 [inline]
 bprm_execve+0xaf8/0x1770 fs/exec.c:1920
 do_execveat_common+0x55f/0x6f0 fs/exec.c:2027
 do_execve fs/exec.c:2101 [inline]
 __do_sys_execve fs/exec.c:2177 [inline]
 __se_sys_execve fs/exec.c:2172 [inline]
 __x64_sys_execve+0x92/0xb0 fs/exec.c:2172
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb5887b0df7
Code: Unable to access opcode bytes at 0x7fb5887b0dcd.
RSP: 002b:00007fb58963ce78 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00007fb588815ef0 RCX: 00007fb5887b0df7
RDX: 00007ffedbc5b9b0 RSI: 00007ffedbc5bbf0 RDI: 00007ffedbc5cef5
RBP: 00007ffedbc5ba20 R08: 00007fb58963cf20 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 000055558020fa80
R13: 0000000000000100 R14: 00007ffedbc5b9d0 R15: 00007ffedbc5b780
 </TASK>


---
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