Message-ID: <0000000000003e37cb05d0127f04@google.com>
Date:   Fri, 05 Nov 2021 15:52:26 -0700
From:   syzbot <syzbot+7535c916093a64efc0d2@...kaller.appspotmail.com>
To:     frederic@...nel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] upstream boot error: WARNING in vtime_user_enter

Hello,

syzbot found the following issue on:

HEAD commit:    fe91c4725aee Merge tag 'scsi-misc' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12651382b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=788cf6fa2a42d474
dashboard link: https://syzkaller.appspot.com/bug?extid=7535c916093a64efc0d2
compiler:       arm-linux-gnueabi-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
userspace arch: arm

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7535c916093a64efc0d2@...kaller.appspotmail.com

Registered RDS/tcp transport
NET: Registered PF_SMC protocol family
9pnet: Installing 9P2000 support
Key type dns_resolver registered
Key type ceph registered
libceph: loaded (mon/osd proto 15/24)
NET: Registered PF_VSOCK protocol family
Registering SWP/SWPB emulation handler
registered taskstats version 1
Loading compiled-in X.509 certificates
Loaded X.509 cert 'Build time autogenerated kernel key: f850c787ad998c396ae089c083b940ff0a9abb77'
zswap: loaded using pool lzo/zbud
Key type ._fscrypt registered
Key type .fscrypt registered
Key type fscrypt-provisioning registered
Key type big_key registered
Key type encrypted registered
ima: No TPM chip found, activating TPM-bypass!
Loading compiled-in module X.509 certificates
Loaded X.509 cert 'Build time autogenerated kernel key: f850c787ad998c396ae089c083b940ff0a9abb77'
ima: Allocated hash algorithm: sha256
ima: No architecture policies found
evm: Initialising EVM extended attributes:
evm: security.selinux
evm: security.SMACK64 (disabled)
evm: security.SMACK64EXEC (disabled)
evm: security.SMACK64TRANSMUTE (disabled)
evm: security.SMACK64MMAP (disabled)
evm: security.apparmor (disabled)
evm: security.ima
evm: security.capability
evm: HMAC attrs: 0x1
printk: console [netcon0] enabled
netconsole: network logging started
gtp: GTP module loaded (pdp ctx size 64 bytes)
ALSA device list:
  #0: Dummy 1
  #1: Loopback 1
  #2: Virtual MIDI Card 1
  #3: ARM AC'97 Interface PL041 rev0 at 0x1c040000, irq 36
uart-pl011 1c090000.serial: no DMA platform data
md: Skipping autodetection of RAID arrays. (raid=autodetect will force)
EXT4-fs (vda): mounted filesystem without journal. Opts: (null). Quota mode: none.
VFS: Mounted root (ext4 filesystem) readonly on device 253:0.
devtmpfs: mounted
Freeing unused kernel image (initmem) memory: 2048K
Failed to set sysctl parameter 'vm.nr_hugepages=4': parameter not found
Failed to set sysctl parameter 'vm.nr_overcommit_hugepages=4': parameter not found
Run /sbin/init as init process
------------[ cut here ]------------
WARNING: CPU: 1 PID: 1 at include/linux/seqlock.h:271 __seqprop_assert include/linux/seqlock.h:271 [inline]
WARNING: CPU: 1 PID: 1 at include/linux/seqlock.h:271 __seqprop_assert include/linux/seqlock.h:269 [inline]
WARNING: CPU: 1 PID: 1 at include/linux/seqlock.h:271 vtime_user_enter+0x13c/0x140 kernel/sched/cputime.c:709
Modules linked in:
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 1 Comm: init Not tainted 5.15.0-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<818473a0>] (dump_backtrace) from [<81847728>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:237)
 r7:81f6ac1c r6:00000080 r5:81f7ca6c r4:60000093
[<81847710>] (show_stack) from [<81851734>] (__dump_stack lib/dump_stack.c:88 [inline])
[<81847710>] (show_stack) from [<81851734>] (dump_stack_lvl+0x70/0x98 lib/dump_stack.c:106)
[<818516c4>] (dump_stack_lvl) from [<81851774>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r7:81f6ac1c r6:82639b0c r5:00000000 r4:82878098
[<8185175c>] (dump_stack) from [<81848284>] (panic+0x114/0x354 kernel/panic.c:232)
[<81848170>] (panic) from [<802437d8>] (__warn+0xa4/0x13c kernel/panic.c:603)
 r3:82622488 r2:00000000 r1:838d7cd8 r0:81f6ac1c
 r7:00000009
[<80243734>] (__warn) from [<8184852c>] (warn_slowpath_fmt+0x68/0xd4 kernel/panic.c:626)
 r8:00000009 r7:8028e1ac r6:0000010f r5:81f62fd0 r4:00000000
[<818484c8>] (warn_slowpath_fmt) from [<8028e1ac>] (__seqprop_assert include/linux/seqlock.h:271 [inline])
[<818484c8>] (warn_slowpath_fmt) from [<8028e1ac>] (__seqprop_assert include/linux/seqlock.h:269 [inline])
[<818484c8>] (warn_slowpath_fmt) from [<8028e1ac>] (vtime_user_enter+0x13c/0x140 kernel/sched/cputime.c:709)
 r8:82622494 r7:00000001 r6:838e0710 r5:81864e90 r4:838e0000
[<8028e070>] (vtime_user_enter) from [<81864e90>] (__context_tracking_enter+0xf8/0x25c kernel/context_tracking.c:82)
 r7:00000001 r6:838e0000 r5:824a7bc8 r4:00000001
[<81864d98>] (__context_tracking_enter) from [<8041bbbc>] (context_tracking_enter kernel/context_tracking.c:122 [inline])
[<81864d98>] (__context_tracking_enter) from [<8041bbbc>] (context_tracking_enter+0x4c/0x7c kernel/context_tracking.c:106)
 r9:838e0000 r8:00000000 r7:00000000 r6:00000000 r5:60000093 r4:00000001
[<8041bb70>] (context_tracking_enter) from [<8041bc84>] (user_enter include/linux/context_tracking.h:28 [inline])
[<8041bb70>] (context_tracking_enter) from [<8041bc84>] (context_tracking_user_enter+0x1c/0x20 kernel/context_tracking.c:130)
 r5:818654dc r4:00000000
[<8041bc68>] (context_tracking_user_enter) from [<802000b4>] (no_work_pending+0x8/0x44)
Exception stack(0x838d7fb0 to 0x838d7ff8)
7fa0:                                     00000000 00000000 00000000 00000000
7fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
7fe0: 00000000 7eb28ed0 00000000 76f66a00 00000010 00000000
Rebooting in 86400 seconds..


---
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