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Sat, 08 Jun 2024 10:29:23 -0700 (PDT) Date: Sat, 08 Jun 2024 10:29:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000cfb785061a64415a@google.com> Subject: [syzbot] [net?] WARNING: suspicious RCU usage in br_mst_set_state (2) From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 8EAEF140004 X-Stat-Signature: fz7gqonmmsuxt51qkg3wb5fn4bq5gskc X-HE-Tag: 1717867764-496017 X-HE-Meta: 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 bK8P/0Pj 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 /vaO4Dx1 d27GDrXP4uWaHhAFHotwSBw5kFg5UQ9CTsDet9L27nGWGRLjbV+xfnCOlFlzyHjOdFz8bk8C67fap8ZT15nt6cgkJlrtbxzvvGEFbQndzFdHdp+/dj/mYXkU46PyarXCCYBTsbmNuFeyuzHR75FTQhvR/XK/xh4JWItrKVo9d1nH0yobkhVKjGz/yQRDUaqQKrmB0Ap/eP2iAXjJPzn/ah5cypVjgc9kyCKZqiHqX5hNXC+PlvJ1xNeMg8xJtyvaftahl7rnMrFWaOp7CeJuqg0xogjADPXC/PeMJlG0UhVLunkHDQp6Sq5MBwdm0CCMjOGFO+8N0EKDdHekPqbKHaQmIWAaEwvnQ9T+vph7hkI= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 8a92980606e3 Merge tag 'scsi-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14f9eaba980000 kernel config: https://syzkaller.appspot.com/x/.config?x=9a6ac4277fffe3ea dashboard link: https://syzkaller.appspot.com/bug?extid=9bbe2de1bc9d470eb5fe 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/e77750e429bf/disk-8a929806.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/910e4410cf78/vmlinux-8a929806.xz kernel image: https://storage.googleapis.com/syzbot-assets/85542820b0d5/bzImage-8a929806.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9bbe2de1bc9d470eb5fe@syzkaller.appspotmail.com ============================= WARNING: suspicious RCU usage 6.10.0-rc2-syzkaller-00235-g8a92980606e3 #0 Not tainted ----------------------------- net/bridge/br_private.h:1599 suspicious rcu_dereference_protected() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 4 locks held by syz-executor.1/5374: #0: ffff888022d50b18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:144 [inline] #0: ffff888022d50b18 (&mm->mmap_lock){++++}-{3:3}, at: __mm_populate+0x1b0/0x460 mm/gup.c:2111 #1: ffffc90000a18c00 ((&p->forward_delay_timer)){+.-.}-{0:0}, at: call_timer_fn+0xc0/0x650 kernel/time/timer.c:1789 #2: ffff88805fb2ccb8 (&br->lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #2: ffff88805fb2ccb8 (&br->lock){+.-.}-{2:2}, at: br_forward_delay_timer_expired+0x50/0x440 net/bridge/br_stp_timer.c:86 #3: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #3: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #3: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: br_mst_set_state+0x171/0x7a0 net/bridge/br_mst.c:105 stack backtrace: CPU: 1 PID: 5374 Comm: syz-executor.1 Not tainted 6.10.0-rc2-syzkaller-00235-g8a92980606e3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __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 nbp_vlan_group net/bridge/br_private.h:1599 [inline] br_mst_set_state+0x29e/0x7a0 net/bridge/br_mst.c:106 br_set_state+0x28a/0x7b0 net/bridge/br_stp.c:47 br_forward_delay_timer_expired+0x176/0x440 net/bridge/br_stp_timer.c:88 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1843 [inline] __run_timers kernel/time/timer.c:2417 [inline] __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428 run_timer_base kernel/time/timer.c:2437 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 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 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [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+0x86/0x290 mm/kasan/generic.c:189 Code: 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd 41 80 3b 00 <0f> 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00 00 45 89 dc RSP: 0018:ffffc90004beec90 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 1ffff9200097dd9c RCX: ffffffff8173cb88 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90004beece0 RBP: ffffffffffffffff R08: ffffc90004beece3 R09: 1ffff9200097dd9c R10: dffffc0000000000 R11: fffff5200097dd9c R12: 1ffff9200097dd98 R13: ffff8880b9544700 R14: dffffc0000000001 R15: fffff5200097dd9d instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1301 [inline] queued_spin_trylock include/asm-generic/qspinlock.h:97 [inline] do_raw_spin_trylock+0xc8/0x1f0 kernel/locking/spinlock_debug.c:123 __raw_spin_trylock include/linux/spinlock_api_smp.h:89 [inline] _raw_spin_trylock+0x20/0x80 kernel/locking/spinlock.c:138 spin_trylock include/linux/spinlock.h:361 [inline] rmqueue_pcplist mm/page_alloc.c:2940 [inline] rmqueue mm/page_alloc.c:2990 [inline] get_page_from_freelist+0x79f/0x2ee0 mm/page_alloc.c:3399 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4660 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 shmem_alloc_folio mm/shmem.c:1628 [inline] shmem_alloc_and_add_folio+0x24d/0xdb0 mm/shmem.c:1668 shmem_get_folio_gfp+0x82d/0x1f50 mm/shmem.c:2055 shmem_fault+0x252/0x6f0 mm/shmem.c:2255 __do_fault+0x135/0x460 mm/memory.c:4562 do_read_fault mm/memory.c:4926 [inline] do_fault mm/memory.c:5056 [inline] do_pte_missing mm/memory.c:3903 [inline] handle_pte_fault+0x3d8d/0x7130 mm/memory.c:5380 __handle_mm_fault mm/memory.c:5523 [inline] handle_mm_fault+0xfb0/0x19d0 mm/memory.c:5688 faultin_page mm/gup.c:1290 [inline] __get_user_pages+0x6ef/0x1590 mm/gup.c:1589 populate_vma_page_range+0x264/0x330 mm/gup.c:2029 __mm_populate+0x27a/0x460 mm/gup.c:2132 mm_populate include/linux/mm.h:3464 [inline] vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:578 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1686c7cf69 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f168799f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f1686db3f80 RCX: 00007f1686c7cf69 RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 00007f1686cda6fe R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f1686db3f80 R15: 00007ffd6eb2ca48 bridge0: port 2(bridge_slave_1) entered learning state ---------------- Code disassembly (best guess), 3 bytes skipped: 0: df 4f 8d fisttps -0x73(%rdi) 3: 3c 31 cmp $0x31,%al 5: 4c 89 fd mov %r15,%rbp 8: 4c 29 dd sub %r11,%rbp b: 48 83 fd 10 cmp $0x10,%rbp f: 7f 29 jg 0x3a 11: 48 85 ed test %rbp,%rbp 14: 0f 84 3e 01 00 00 je 0x158 1a: 4c 89 cd mov %r9,%rbp 1d: 48 f7 d5 not %rbp 20: 48 01 dd add %rbx,%rbp 23: 41 80 3b 00 cmpb $0x0,(%r11) * 27: 0f 85 c9 01 00 00 jne 0x1f6 <-- trapping instruction 2d: 49 ff c3 inc %r11 30: 48 ff c5 inc %rbp 33: 75 ee jne 0x23 35: e9 1e 01 00 00 jmp 0x158 3a: 45 89 dc mov %r11d,%r12d --- 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@googlegroups.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