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Message-ID: <67447073.050a0220.1cc393.007b.GAE@google.com>
Date: Mon, 25 Nov 2024 04:41:23 -0800
From: syzbot <syzbot+7f4f9a43a9c78eaee04f@...kaller.appspotmail.com>
To: Jason@...c4.com, bigeasy@...utronix.de, boqun.feng@...il.com,
hdanton@...a.com, jason@...c4.com, linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: [syzbot] [kernel?] WARNING: locking bug in get_random_u8
syzbot has found a reproducer for the following issue on:
HEAD commit: 9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16ee775f980000
kernel config: https://syzkaller.appspot.com/x/.config?x=d8bc8a5565eebec6
dashboard link: https://syzkaller.appspot.com/bug?extid=7f4f9a43a9c78eaee04f
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1612dee8580000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-9f16d5e6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dbaabe559df8/vmlinux-9f16d5e6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5fe0afceb260/bzImage-9f16d5e6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7f4f9a43a9c78eaee04f@...kaller.appspotmail.com
=============================
[ BUG: Invalid wait context ]
6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Not tainted
-----------------------------
sshd/5973 is trying to lock:
ffff88806a63af60 (batched_entropy_u8.lock){..-.}-{3:3}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
ffff88806a63af60 (batched_entropy_u8.lock){..-.}-{3:3}, at: get_random_u8+0xef/0x7f0 drivers/char/random.c:551
other info that might help us debug this:
context-{2:2}
2 locks held by sshd/5973:
#0: ffffffff8e1bba80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e1bba80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e1bba80 (rcu_read_lock){....}-{1:3}, at: lock_vma_under_rcu+0xe4/0x980 mm/memory.c:6272
#1: ffff88806a63ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598
stack backtrace:
CPU: 0 UID: 0 PID: 5973 Comm: sshd Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_lock_invalid_wait_context kernel/locking/lockdep.c:4826 [inline]
check_wait_context kernel/locking/lockdep.c:4898 [inline]
__lock_acquire+0x878/0x3c40 kernel/locking/lockdep.c:5176
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
get_random_u8+0x107/0x7f0 drivers/char/random.c:551
get_random_u32_below include/linux/random.h:78 [inline]
kfence_guarded_alloc mm/kfence/core.c:421 [inline]
__kfence_alloc+0x4e8/0x15f0 mm/kfence/core.c:1136
kfence_alloc include/linux/kfence.h:129 [inline]
slab_alloc_node mm/slub.c:4118 [inline]
__kmalloc_cache_noprof+0x1e4/0x300 mm/slub.c:4290
kmalloc_noprof include/linux/slab.h:879 [inline]
add_stack_record_to_list mm/page_owner.c:172 [inline]
inc_stack_record_count mm/page_owner.c:214 [inline]
__set_page_owner+0x34d/0x560 mm/page_owner.c:329
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556
prep_new_page mm/page_alloc.c:1564 [inline]
get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474
__alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751
alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265
stack_depot_save_flags+0x566/0x8f0 lib/stackdepot.c:627
kasan_save_stack+0x42/0x60 mm/kasan/common.c:48
__kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541
task_work_add+0xc0/0x3b0 kernel/task_work.c:77
task_tick_numa kernel/sched/fair.c:3607 [inline]
task_tick_fair+0x524/0x8e0 kernel/sched/fair.c:13054
sched_tick+0x1dd/0x4f0 kernel/sched/core.c:5652
update_process_times+0x19c/0x2d0 kernel/time/timer.c:2524
tick_sched_handle kernel/time/tick-sched.c:276 [inline]
tick_nohz_handler+0x376/0x530 kernel/time/tick-sched.c:297
__run_hrtimer kernel/time/hrtimer.c:1739 [inline]
__hrtimer_run_queues+0x5fb/0xae0 kernel/time/hrtimer.c:1803
hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_preemption_disabled+0x2/0xe0 lib/smp_processor_id.c:13
Code: 0f 65 8b 05 5c b2 d3 74 85 c0 74 04 90 0f 0b 90 e9 53 fc ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 54 <55> 53 48 83 ec 08 65 8b 1d ad 02 d5 74 65 8b 05 a2 02 d5 74 a9 ff
RSP: 0000:ffffc90003e1fc58 EFLAGS: 00000282
RAX: 0000000000000001 RBX: ffff88803221720c RCX: ffffffff8b1a7dad
RDX: 0000000000000001 RSI: ffffffff8bd1e0c0 RDI: ffffffff8bd1e100
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000006
R13: 0000000000000000 R14: 0000000000000300 R15: 00007f9bd4999fff
rcu_lockdep_current_cpu_online+0x35/0x150 kernel/rcu/tree.c:4777
rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
rcu_read_lock_held+0x27/0x50 kernel/rcu/update.c:349
mt_slot lib/maple_tree.c:803 [inline]
mtree_range_walk+0x25b/0xbe0 lib/maple_tree.c:2802
mas_state_walk lib/maple_tree.c:3620 [inline]
mas_walk+0x4f9/0x910 lib/maple_tree.c:4946
lock_vma_under_rcu+0x2b5/0x980 mm/memory.c:6274
do_user_addr_fault+0x457/0x13f0 arch/x86/mm/fault.c:1329
handle_page_fault arch/x86/mm/fault.c:1481 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x55f75beb0823
Code: 4c 89 ed 4c 89 e7 f3 aa eb 48 4c 89 e7 e8 95 48 f7 ff 48 89 c5 48 85 c0 74 38 48 89 c7 4c 89 ee 4d 39 f4 76 11 4c 89 f1 31 c0 <f3> a4 4c 89 e1 4c 29 f1 f3 aa eb 05 4c 89 e1 f3 a4 4c 89 ef 48 83
RSP: 002b:00007ffed36adfb0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000360000 RCX: 0000000000228010
RDX: 0000000000000002 RSI: 00007f9bd3f8c000 RDI: 00007f9bd461e000
RBP: 00007f9bd44ee010 R08: 00007f9bd44ee010 R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000360000
R13: 00007f9bd3e5c010 R14: 0000000000358000 R15: 00007ffed36ae168
</TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 65 8b 05 5c b2 d3 74 mov %gs:0x74d3b25c(%rip),%eax # 0x74d3b263
7: 85 c0 test %eax,%eax
9: 74 04 je 0xf
b: 90 nop
c: 0f 0b ud2
e: 90 nop
f: e9 53 fc ff ff jmp 0xfffffc67
14: 0f 1f 00 nopl (%rax)
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: 90 nop
23: 90 nop
24: 90 nop
25: 90 nop
26: 90 nop
27: 41 54 push %r12
* 29: 55 push %rbp <-- trapping instruction
2a: 53 push %rbx
2b: 48 83 ec 08 sub $0x8,%rsp
2f: 65 8b 1d ad 02 d5 74 mov %gs:0x74d502ad(%rip),%ebx # 0x74d502e3
36: 65 8b 05 a2 02 d5 74 mov %gs:0x74d502a2(%rip),%eax # 0x74d502df
3d: a9 .byte 0xa9
3e: ff .byte 0xff
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
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