linux-kernel - [syzbot] WARNING: suspicious RCU usage in atomic_notifier_call

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Date:   Mon, 20 Jun 2022 01:13:29 -0700
From:   syzbot <syzbot+3333557f53051744538d@...kaller.appspotmail.com>
To:     bigeasy@...utronix.de, bp@...e.de, dmitry.osipenko@...labora.com,
        linux-kernel@...r.kernel.org, mirq-linux@...e.qmqm.pl,
        rafael.j.wysocki@...el.com, syzkaller-bugs@...glegroups.com,
        vschneid@...hat.com
Subject: [syzbot] WARNING: suspicious RCU usage in atomic_notifier_call_chain

Hello,

syzbot found the following issue on:

HEAD commit:    07dc787be231 Add linux-next specific files for 20220617
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13f4d5d8080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d2512136c9b01d87
dashboard link: https://syzkaller.appspot.com/bug?extid=3333557f53051744538d
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

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+3333557f53051744538d@...kaller.appspotmail.com

 arch_call_rest_init+0xf/0x14 init/main.c:886
 start_kernel+0x473/0x494 init/main.c:1142
 secondary_startup_64_no_verify+0xce/0xdb
 </TASK>
=============================
WARNING: suspicious RCU usage
5.19.0-rc2-next-20220617-syzkaller #0 Not tainted
-----------------------------
include/linux/rcupdate.h:707 rcu_read_lock() used illegally while idle!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
RCU used illegally from extended quiescent state!
1 lock held by swapper/0/0:
 #0: ffffffff8bd87780 (rcu_read_lock){....}-{1:2}, at: atomic_notifier_call_chain+0x0/0x180 kernel/notifier.c:455

stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc2-next-20220617-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 rcu_read_lock include/linux/rcupdate.h:707 [inline]
 atomic_notifier_call_chain+0x112/0x180 kernel/notifier.c:224
 panic+0x35f/0x64a kernel/panic.c:316
 __warn.cold+0x1ea/0x2cd kernel/panic.c:627
 report_bug+0x1bc/0x210 lib/bug.c:198
 handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:316
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:336
 asm_exc_invalid_op+0x1b/0x20 arch/x86/include/asm/idtentry.h:568
RIP: 0010:ct_idle_exit+0x34/0x40 kernel/context_tracking.c:335
Code: 00 02 00 00 31 ff 48 89 de 0f 1f 44 00 00 48 85 db 75 12 0f 1f 44 00 00 5b be 03 00 00 00 31 ff e9 01 fe ff ff 0f 1f 44 00 00 <0f> 0b eb e5 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 41 89 f4 55
RSP: 0018:ffffffff8ba07d90 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
RDX: ffffffff8babc980 RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffffffff8c7c0200 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 cpuidle_enter_state+0x6f7/0xc80 drivers/cpuidle/cpuidle.c:240
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:352
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x3e8/0x590 kernel/sched/idle.c:303
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
 rest_init+0x169/0x270 init/main.c:729
 arch_call_rest_init+0xf/0x14 init/main.c:886
 start_kernel+0x473/0x494 init/main.c:1142
 secondary_startup_64_no_verify+0xce/0xdb
 </TASK>
Kernel Offset: disabled

=============================
WARNING: suspicious RCU usage
5.19.0-rc2-next-20220617-syzkaller #0 Not tainted
-----------------------------
include/linux/rcupdate.h:735 rcu_read_unlock() used illegally while idle!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
RCU used illegally from extended quiescent state!
1 lock held by swapper/0/0:
 #0: ffffffff8bd87780 (rcu_read_lock){....}-{1:2}, at: atomic_notifier_call_chain+0x0/0x180 kernel/notifier.c:455

stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc2-next-20220617-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 rcu_read_unlock include/linux/rcupdate.h:735 [inline]
 atomic_notifier_call_chain+0x175/0x180 kernel/notifier.c:226
 panic+0x35f/0x64a kernel/panic.c:316
 __warn.cold+0x1ea/0x2cd kernel/panic.c:627
 report_bug+0x1bc/0x210 lib/bug.c:198
 handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:316
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:336
 asm_exc_invalid_op+0x1b/0x20 arch/x86/include/asm/idtentry.h:568
RIP: 0010:ct_idle_exit+0x34/0x40 kernel/context_tracking.c:335
Code: 00 02 00 00 31 ff 48 89 de 0f 1f 44 00 00 48 85 db 75 12 0f 1f 44 00 00 5b be 03 00 00 00 31 ff e9 01 fe ff ff 0f 1f 44 00 00 <0f> 0b eb e5 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 41 89 f4 55
RSP: 0018:ffffffff8ba07d90 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
RDX: ffffffff8babc980 RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffffffff8c7c0200 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 cpuidle_enter_state+0x6f7/0xc80 drivers/cpuidle/cpuidle.c:240
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:352
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x3e8/0x590 kernel/sched/idle.c:303
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
 rest_init+0x169/0x270 init/main.c:729
 arch_call_rest_init+0xf/0x14 init/main.c:886
 start_kernel+0x473/0x494 init/main.c:1142
 secondary_startup_64_no_verify+0xce/0xdb
 </TASK>

=============================
WARNING: suspicious RCU usage
5.19.0-rc2-next-20220617-syzkaller #0 Not tainted
-----------------------------
include/linux/rcupdate.h:707 rcu_read_lock() used illegally while idle!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
RCU used illegally from extended quiescent state!
1 lock held by swapper/0/0:
 #0: ffffffff8bd87780 (rcu_read_lock){....}-{1:2}, at: kmsg_dump+0x0/0x260 kernel/printk/printk.c:3982

stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc2-next-20220617-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 rcu_read_lock include/linux/rcupdate.h:707 [inline]
 kmsg_dump+0x1c8/0x260 kernel/printk/printk.c:4122
 panic+0x36e/0x64a kernel/panic.c:320
 __warn.cold+0x1ea/0x2cd kernel/panic.c:627
 report_bug+0x1bc/0x210 lib/bug.c:198
 handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:316
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:336
 asm_exc_invalid_op+0x1b/0x20 arch/x86/include/asm/idtentry.h:568
RIP: 0010:ct_idle_exit+0x34/0x40 kernel/context_tracking.c:335
Code: 00 02 00 00 31 ff 48 89 de 0f 1f 44 00 00 48 85 db 75 12 0f 1f 44 00 00 5b be 03 00 00 00 31 ff e9 01 fe ff ff 0f 1f 44 00 00 <0f> 0b eb e5 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 41 89 f4 55
RSP: 0018:ffffffff8ba07d90 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
RDX: ffffffff8babc980 RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffffffff8c7c0200 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 cpuidle_enter_state+0x6f7/0xc80 drivers/cpuidle/cpuidle.c:240
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:352
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x3e8/0x590 kernel/sched/idle.c:303
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
 rest_init+0x169/0x270 init/main.c:729
 arch_call_rest_init+0xf/0x14 init/main.c:886
 start_kernel+0x473/0x494 init/main.c:1142
 secondary_startup_64_no_verify+0xce/0xdb
 </TASK>

=============================
WARNING: suspicious RCU usage
5.19.0-rc2-next-20220617-syzkaller #0 Not tainted
-----------------------------
include/linux/rcupdate.h:735 rcu_read_unlock() used illegally while idle!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
RCU used illegally from extended quiescent state!
1 lock held by swapper/0/0:
 #0: ffffffff8bd87780 (rcu_read_lock){....}-{1:2}, at: kmsg_dump+0x0/0x260 kernel/printk/printk.c:3982

stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc2-next-20220617-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 rcu_read_unlock include/linux/rcupdate.h:735 [inline]
 kmsg_dump+0x22b/0x260 kernel/printk/printk.c:4140
 panic+0x36e/0x64a kernel/panic.c:320
 __warn.cold+0x1ea/0x2cd kernel/panic.c:627
 report_bug+0x1bc/0x210 lib/bug.c:198
 handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:316
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:336
 asm_exc_invalid_op+0x1b/0x20 arch/x86/include/asm/idtentry.h:568
RIP: 0010:ct_idle_exit+0x34/0x40 kernel/context_tracking.c:335
Code: 00 02 00 00 31 ff 48 89 de 0f 1f 44 00 00 48 85 db 75 12 0f 1f 44 00 00 5b be 03 00 00 00 31 ff e9 01 fe ff ff 0f 1f 44 00 00 <0f> 0b eb e5 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 41 89 f4 55
RSP: 0018:ffffffff8ba07d90 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
RDX: ffffffff8babc980 RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffffffff8c7c0200 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 cpuidle_enter_state+0x6f7/0xc80 drivers/cpuidle/cpuidle.c:240
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:352
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x3e8/0x590 kernel/sched/idle.c:303
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
 rest_init+0x169/0x270 init/main.c:729
 arch_call_rest_init+0xf/0x14 init/main.c:886
 start_kernel+0x473/0x494 init/main.c:1142
 secondary_startup_64_no_verify+0xce/0xdb
 </TASK>
Rebooting in 86400 seconds..


---
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.