syzbot has found a reproducer for the following issue on: HEAD commit: e8361b005d7c Add linux-next specific files for 20231023 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1207cb05680000 kernel config: https://syzkaller.appspot.com/x/.config?x=75e8fc3570ec9a74 dashboard link: https://syzkaller.appspot.com/bug?extid=79fcba037b6df73756d3 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=107fab89680000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e28a7944599e/disk-e8361b00.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7dd355dbe055/vmlinux-e8361b00.xz kernel image: https://storage.googleapis.com/syzbot-assets/7b2a9050635d/bzImage-e8361b00.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+79fcba037b6df73756d3@xxxxxxxxxxxxxxxxxxxxxxxxx ============================= WARNING: suspicious RCU usage 6.6.0-rc6-next-20231023-syzkaller #0 Not tainted ----------------------------- lib/maple_tree.c:856 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 no locks held by syz-executor.4/5222. stack backtrace: CPU: 0 PID: 5222 Comm: syz-executor.4 Not tainted 6.6.0-rc6-next-20231023-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106 lockdep_rcu_suspicious+0x20b/0x3a0 kernel/locking/lockdep.c:6711 mas_root lib/maple_tree.c:856 [inline] mas_root lib/maple_tree.c:854 [inline] mas_start lib/maple_tree.c:1385 [inline] mas_state_walk lib/maple_tree.c:3705 [inline] mas_walk+0x4d1/0x7d0 lib/maple_tree.c:4888 mas_find_setup lib/maple_tree.c:5948 [inline] mas_find+0x1e6/0x400 lib/maple_tree.c:5989 vma_find include/linux/mm.h:952 [inline] do_mbind+0xc8f/0x1010 mm/mempolicy.c:1328 kernel_mbind+0x1d4/0x1f0 mm/mempolicy.c:1486 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x7f9979c7cae9 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:00007f9978ffe0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed RAX: ffffffffffffffda RBX: 00007f9979d9c050 RCX: 00007f9979c7cae9 RDX: 0000000000000003 RSI: 0000000000005000 RDI: 0000000020182000 RBP: 00007f9979cc847a R08: 000000000000007f R09: 0000000000000003 R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f9979d9c050 R15: 00007ffdbdd465f8 </TASK> ============================= WARNING: suspicious RCU usage 6.6.0-rc6-next-20231023-syzkaller #0 Not tainted ----------------------------- lib/maple_tree.c:812 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 no locks held by syz-executor.4/5222. stack backtrace: CPU: 0 PID: 5222 Comm: syz-executor.4 Not tainted 6.6.0-rc6-next-20231023-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106 lockdep_rcu_suspicious+0x20b/0x3a0 kernel/locking/lockdep.c:6711 mt_slot lib/maple_tree.c:812 [inline] mt_slot lib/maple_tree.c:809 [inline] mtree_range_walk+0x6c5/0x9b0 lib/maple_tree.c:2827 mas_state_walk lib/maple_tree.c:3712 [inline] mas_walk+0x374/0x7d0 lib/maple_tree.c:4888 mas_find_setup lib/maple_tree.c:5948 [inline] mas_find+0x1e6/0x400 lib/maple_tree.c:5989 vma_find include/linux/mm.h:952 [inline] do_mbind+0xc8f/0x1010 mm/mempolicy.c:1328 kernel_mbind+0x1d4/0x1f0 mm/mempolicy.c:1486 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x7f9979c7cae9 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:00007f9978ffe0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed RAX: ffffffffffffffda RBX: 00007f9979d9c050 RCX: 00007f9979c7cae9 RDX: 0000000000000003 RSI: 0000000000005000 RDI: 0000000020182000 RBP: 00007f9979cc847a R08: 000000000000007f R09: 0000000000000003 R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f9979d9c050 R15: 00007ffdbdd465f8 </TASK> --- 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.
