Messages in this thread | | | Date | Tue, 30 Apr 2024 04:09:04 -0700 | Subject | Re: [syzbot] [net?] [virt?] [kvm?] KASAN: slab-use-after-free Read in vhost_task_fn | From | syzbot <> |
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Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING: suspicious RCU usage in __do_softirq
============================= WARNING: suspicious RCU usage 6.9.0-rc5-next-20240426-syzkaller-dirty #0 Not tainted ----------------------------- kernel/rcu/tree.c:276 Illegal rcu_softirq_qs() in RCU read-side critical section!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1 1 lock held by ksoftirqd/0/16: #0: ffffffff8e333b20 (rcu_read_lock_sched){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8e333b20 (rcu_read_lock_sched){....}-{1:2}, at: rcu_read_lock_sched include/linux/rcupdate.h:933 [inline] #0: ffffffff8e333b20 (rcu_read_lock_sched){....}-{1:2}, at: pfn_valid include/linux/mmzone.h:2022 [inline] #0: ffffffff8e333b20 (rcu_read_lock_sched){....}-{1:2}, at: __virt_addr_valid+0x183/0x520 arch/x86/mm/physaddr.c:65
stack backtrace: CPU: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.9.0-rc5-next-20240426-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 lockdep_rcu_suspicious+0x221/0x340 kernel/locking/lockdep.c:6712 rcu_softirq_qs+0xd9/0x370 kernel/rcu/tree.c:273 __do_softirq+0x5fd/0x980 kernel/softirq.c:568 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633 irq_exit_rcu+0x9/0x30 kernel/softirq.c:645 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 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:check_preemption_disabled+0x2/0x120 lib/smp_processor_id.c:13 Code: c4 1f 8c 48 c7 c6 c0 c4 1f 8c eb 1c 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 <41> 56 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 RSP: 0018:ffffc900001578f0 EFLAGS: 00000287 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff8172cd10 RDX: 0000000000000000 RSI: ffffffff8c1fc4c0 RDI: ffffffff8c1fc480 RBP: ffffc90000157a48 R08: ffffffff8fac7fef R09: 1ffffffff1f58ffd R10: dffffc0000000000 R11: fffffbfff1f58ffe R12: 1ffff9200002af30 R13: ffffffff81423f93 R14: ffffffff81423f93 R15: dffffc0000000000 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline] rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:725 trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0xbf/0x9f0 kernel/locking/lockdep.c:5765 rcu_lock_release include/linux/rcupdate.h:339 [inline] rcu_read_unlock_sched include/linux/rcupdate.h:954 [inline] pfn_valid include/linux/mmzone.h:2032 [inline] __virt_addr_valid+0x41e/0x520 arch/x86/mm/physaddr.c:65 kasan_addr_to_slab+0xd/0x80 mm/kasan/common.c:37 __kasan_record_aux_stack+0x11/0xc0 mm/kasan/generic.c:526 __call_rcu_common kernel/rcu/tree.c:3103 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3207 context_switch kernel/sched/core.c:5411 [inline] __schedule+0x17f0/0x4a50 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6837 smpboot_thread_fn+0x61e/0xa30 kernel/smpboot.c:160 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> ---------------- Code disassembly (best guess), 3 bytes skipped: 0: 48 c7 c6 c0 c4 1f 8c mov $0xffffffff8c1fc4c0,%rsi 7: eb 1c jmp 0x25 9: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 10: 00 00 00 13: 66 90 xchg %ax,%ax 15: 90 nop 16: 90 nop 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: 41 57 push %r15 * 27: 41 56 push %r14 <-- trapping instruction 29: 41 54 push %r12 2b: 53 push %rbx 2c: 48 83 ec 10 sub $0x10,%rsp 30: 65 48 8b 04 25 28 00 mov %gs:0x28,%rax 37: 00 00 39: 48 rex.W 3a: 89 .byte 0x89 3b: 44 rex.R 3c: 24 .byte 0x24
Tested on:
commit: bb7a2467 Add linux-next specific files for 20240426 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git console output: https://syzkaller.appspot.com/x/log.txt?x=12a94f0f180000 kernel config: https://syzkaller.appspot.com/x/.config?x=5c6a0288262dd108 dashboard link: https://syzkaller.appspot.com/bug?extid=98edc2df894917b3431f compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=16df8838980000
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