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Message-ID: <67f66c9c.050a0220.25d1c8.0003.GAE@google.com> Date: Wed, 09 Apr 2025 05:48:28 -0700 From: syzbot <syzbot+27d7cfbc93457e472e00@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [net?] KASAN: null-ptr-deref Write in rcuref_put (4) Hello, syzbot found the following issue on: HEAD commit: a52a3c18cdf3 Merge tag 'ntb-6.15' of https://github.com/jo.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15764be4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=695196aa2bd08d99 dashboard link: https://syzkaller.appspot.com/bug?extid=27d7cfbc93457e472e00 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/326c7eeab15a/disk-a52a3c18.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/10c3ccb3546c/vmlinux-a52a3c18.xz kernel image: https://storage.googleapis.com/syzbot-assets/0bd8832c1d9c/bzImage-a52a3c18.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+27d7cfbc93457e472e00@...kaller.appspotmail.com ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: null-ptr-deref in atomic_sub_return_release include/linux/atomic/atomic-instrumented.h:326 [inline] BUG: KASAN: null-ptr-deref in __rcuref_put include/linux/rcuref.h:89 [inline] BUG: KASAN: null-ptr-deref in rcuref_put+0x1a1/0x240 include/linux/rcuref.h:153 Write of size 4 at addr 0000000000000041 by task udevd/6807 CPU: 1 UID: 0 PID: 6807 Comm: udevd Not tainted 6.14.0-syzkaller-13389-ga52a3c18cdf3 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_report+0xe3/0x5b0 mm/kasan/report.c:524 kasan_report+0x143/0x180 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x28f/0x2a0 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_sub_return_release include/linux/atomic/atomic-instrumented.h:326 [inline] __rcuref_put include/linux/rcuref.h:89 [inline] rcuref_put+0x1a1/0x240 include/linux/rcuref.h:153 dst_release+0x24/0x1b0 net/core/dst.c:167 dst_cache_reset_now+0x1b0/0x220 net/core/dst_cache.c:183 wg_socket_clear_peer_endpoint_src+0x40/0x50 drivers/net/wireguard/socket.c:312 wg_expired_retransmit_handshake+0xd3/0x2d0 drivers/net/wireguard/timers.c:73 call_timer_fn+0x189/0x650 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x66e/0x8e0 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd9/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 2b 00 74 08 4c 89 f7 e8 3d bd ff f5 f6 44 24 21 02 75 55 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 32 58 65 f5 65 8b 05 0b 1e 3a 07 85 c0 74 46 48 c7 04 24 0e 36 RSP: 0018:ffffc90003f97280 EFLAGS: 00000206 RAX: ba8754475f048600 RBX: 1ffff920007f2e54 RCX: ffffffff81cb37bc RDX: 0000000000000000 RSI: ffffffff8e687288 RDI: 0000000000000001 RBP: ffffc90003f97310 R08: ffffffff905eac77 R09: 1ffffffff20bd58e R10: dffffc0000000000 R11: fffffbfff20bd58f R12: 1ffff920007f2e50 R13: dffffc0000000000 R14: ffffc90003f972a0 R15: 0000000000000246 __debug_check_no_obj_freed lib/debugobjects.c:1108 [inline] debug_check_no_obj_freed+0x572/0x590 lib/debugobjects.c:1129 free_pages_prepare mm/page_alloc.c:1269 [inline] free_unref_folios+0x576/0x17e0 mm/page_alloc.c:2737 folios_put_refs+0x70a/0x800 mm/swap.c:992 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x595/0x1820 mm/shmem.c:1125 shmem_truncate_range mm/shmem.c:1237 [inline] shmem_evict_inode+0x29d/0xa80 mm/shmem.c:1365 evict+0x4f9/0x9b0 fs/inode.c:810 __dentry_kill+0x20d/0x630 fs/dcache.c:660 dput+0x19f/0x2b0 fs/dcache.c:902 __fput+0x60b/0x9f0 fs/file_table.c:473 task_work_run+0x251/0x310 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8f833170a8 Code: 48 8b 05 83 9d 0d 00 64 c7 00 16 00 00 00 83 c8 ff 48 83 c4 20 5b c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 5b 48 8b 15 51 9d 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffc3678eaf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007f8f83761ae0 RCX: 00007f8f833170a8 RDX: 00005574fff315c8 RSI: 00007ffc3678e2f8 RDI: 0000000000000008 RBP: 00005571a8e7a620 R08: 0000000000000006 R09: cd47be37b8f960f8 R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000002 R13: 00005571a8e8a890 R14: 0000000000000008 R15: 00005571a8e73910 </TASK> ================================================================== ---------------- Code disassembly (best guess): 0: 9c pushf 1: 8f 44 24 20 pop 0x20(%rsp) 5: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) a: 74 08 je 0x14 c: 4c 89 f7 mov %r14,%rdi f: e8 3d bd ff f5 call 0xf5ffbd51 14: f6 44 24 21 02 testb $0x2,0x21(%rsp) 19: 75 55 jne 0x70 1b: 41 f7 c7 00 02 00 00 test $0x200,%r15d 22: 74 01 je 0x25 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 32 58 65 f5 call 0xf5655861 <-- trapping instruction 2f: 65 8b 05 0b 1e 3a 07 mov %gs:0x73a1e0b(%rip),%eax # 0x73a1e41 36: 85 c0 test %eax,%eax 38: 74 46 je 0x80 3a: 48 rex.W 3b: c7 .byte 0xc7 3c: 04 24 add $0x24,%al 3e: 0e (bad) 3f: 36 ss --- 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. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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