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Message-ID: <6743e5af.050a0220.1cc393.0055.GAE@google.com>
Date: Sun, 24 Nov 2024 18:49:19 -0800
From: syzbot <syzbot+5abecb17ba9299033d79@...kaller.appspotmail.com>
To: adilger.kernel@...ger.ca, akpm@...ux-foundation.org,
linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: [syzbot] [ext4?] WARNING: locking bug in get_page_from_freelist
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=1202a530580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7393f07275e8e571
dashboard link: https://syzkaller.appspot.com/bug?extid=5abecb17ba9299033d79
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=177ab75f980000
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/8a4ab7536099/vmlinux-9f16d5e6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a94d1bc43eff/bzImage-9f16d5e6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5abecb17ba9299033d79@...kaller.appspotmail.com
=============================
[ BUG: Invalid wait context ]
6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Not tainted
-----------------------------
sshd/5943 is trying to lock:
ffff88807ffd8298 (&zone->lock){..-.}-{3:3}, at: rmqueue_buddy mm/page_alloc.c:2907 [inline]
ffff88807ffd8298 (&zone->lock){..-.}-{3:3}, at: rmqueue mm/page_alloc.c:3080 [inline]
ffff88807ffd8298 (&zone->lock){..-.}-{3:3}, at: get_page_from_freelist+0xbbe/0x2f80 mm/page_alloc.c:3471
other info that might help us debug this:
context-{2:2}
3 locks held by sshd/5943:
#0: ffff888022f8b148 (&vma->vm_lock->lock){++++}-{4:4}, at: vma_start_read include/linux/mm.h:716 [inline]
#0: ffff888022f8b148 (&vma->vm_lock->lock){++++}-{4:4}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6278
#1: ffff88806a944c58 (&pcp->lock){+.+.}-{3:3}, at: spin_trylock include/linux/spinlock.h:361 [inline]
#1: ffff88806a944c58 (&pcp->lock){+.+.}-{3:3}, at: rmqueue_pcplist mm/page_alloc.c:3030 [inline]
#1: ffff88806a944c58 (&pcp->lock){+.+.}-{3:3}, at: rmqueue mm/page_alloc.c:3074 [inline]
#1: ffff88806a944c58 (&pcp->lock){+.+.}-{3:3}, at: get_page_from_freelist+0x350/0x2f80 mm/page_alloc.c:3471
#2: ffff88806a93ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598
stack backtrace:
CPU: 3 UID: 0 PID: 5943 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
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
rmqueue_buddy mm/page_alloc.c:2907 [inline]
rmqueue mm/page_alloc.c:3080 [inline]
get_page_from_freelist+0xbbe/0x2f80 mm/page_alloc.c:3471
__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:bytes_is_nonzero mm/kasan/generic.c:86 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0xfb/0x1a0 mm/kasan/generic.c:189
Code: d2 74 1e 41 83 e2 07 49 39 d1 75 0a 45 3a 11 b8 01 00 00 00 7c 0b 44 89 c2 e8 e1 ea ff ff 83 f0 01 5b 5d 41 5c c3 cc cc cc cc <48> 85 d2 74 4f 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 41 80 38 00
RSP: 0000:ffffc90003e97610 EFLAGS: 00000283
RAX: fffffbfff20beb82 RBX: fffffbfff20beb83 RCX: ffffffff816b64e9
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff905f5c10
RBP: fffffbfff20beb82 R08: 0000000000000000 R09: fffffbfff20beb82
R10: ffffffff905f5c17 R11: 0000000000000001 R12: ffff88806a944c58
R13: 0000000000000070 R14: dffffc0000000000 R15: ffff88807ffd7c80
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
cpumask_test_cpu include/linux/cpumask.h:570 [inline]
cpu_online include/linux/cpumask.h:1117 [inline]
trace_lock_release include/trace/events/lock.h:69 [inline]
lock_release+0xa9/0x6f0 kernel/locking/lockdep.c:5860
__raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
_raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
rmqueue_pcplist mm/page_alloc.c:3044 [inline]
rmqueue mm/page_alloc.c:3074 [inline]
get_page_from_freelist+0x3df/0x2f80 mm/page_alloc.c:3471
__alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751
alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265
folio_alloc_mpol_noprof+0x36/0xd0 mm/mempolicy.c:2283
vma_alloc_folio_noprof+0xee/0x1b0 mm/mempolicy.c:2313
folio_prealloc mm/memory.c:1060 [inline]
alloc_anon_folio mm/memory.c:4752 [inline]
do_anonymous_page mm/memory.c:4809 [inline]
do_pte_missing+0x2021/0x3e70 mm/memory.c:3977
handle_pte_fault mm/memory.c:5801 [inline]
__handle_mm_fault+0x103c/0x2a40 mm/memory.c:5944
handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6112
do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338
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: 0033:0x558b31029823
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:00007ffc18dbe180 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000350000 RCX: 000000000011e010
RDX: 0000000000000002 RSI: 00007fa8c26db000 RDI: 00007fa8c238a000
RBP: 00007fa8c2160010 R08: 00007fa8c2160010 R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000350000
R13: 00007fa8c24b1010 R14: 0000000000348000 R15: 00007ffc18dbe338
</TASK>
----------------
Code disassembly (best guess):
0: d2 74 1e 41 shlb %cl,0x41(%rsi,%rbx,1)
4: 83 e2 07 and $0x7,%edx
7: 49 39 d1 cmp %rdx,%r9
a: 75 0a jne 0x16
c: 45 3a 11 cmp (%r9),%r10b
f: b8 01 00 00 00 mov $0x1,%eax
14: 7c 0b jl 0x21
16: 44 89 c2 mov %r8d,%edx
19: e8 e1 ea ff ff call 0xffffeaff
1e: 83 f0 01 xor $0x1,%eax
21: 5b pop %rbx
22: 5d pop %rbp
23: 41 5c pop %r12
25: c3 ret
26: cc int3
27: cc int3
28: cc int3
29: cc int3
* 2a: 48 85 d2 test %rdx,%rdx <-- trapping instruction
2d: 74 4f je 0x7e
2f: 48 01 ea add %rbp,%rdx
32: eb 09 jmp 0x3d
34: 48 83 c0 01 add $0x1,%rax
38: 48 39 d0 cmp %rdx,%rax
3b: 74 41 je 0x7e
3d: 80 38 00 cmpb $0x0,(%rax)
---
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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