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[209.132.180.67]) by mx.google.com with ESMTP id a5-v6si222486plh.312.2018.08.27.14.05.48; Mon, 27 Aug 2018 14:06:03 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727309AbeH1AwV (ORCPT + 99 others); Mon, 27 Aug 2018 20:52:21 -0400 Received: from mail-io0-f199.google.com ([209.85.223.199]:33587 "EHLO mail-io0-f199.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727100AbeH1AwV (ORCPT ); Mon, 27 Aug 2018 20:52:21 -0400 Received: by mail-io0-f199.google.com with SMTP id s14-v6so340253ioc.0 for ; Mon, 27 Aug 2018 14:04:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=H4ZSuz5fIu1OCbE4UKJPGgrDQxN5PYYwdRfI01Ey7nA=; b=FiLToOz9Jni8/Vymz426x7C+PfFP5hyy6ptWFqGyUFIuNYSggHrWpia3qB3FjWqb42 4wGcto1Y6wkQea7qya+7lmMf/alGa7mU4eTBjGMNo3WU9zcSBnD0PKqnBVP7qkvOCGPh UGT+s2wMRf7TpdmUH7gNr+NxUK4QvVQY1LzoQYW7uolpsMBGlnS/BJXeKPJZPcslL3qF 8yvoTUjTi/LjIPMPyy9Azr0IKvYtN34SftCyV+bW1brchTYHYoNaYhjpXBzoyIaXgcil uwoRPOoubfePcm/RbBxGyvMexTB1KNqAacBLTeCcKkJhLL1Y4hqmgIlgNRnnD//cnKH4 iMGQ== X-Gm-Message-State: APzg51CTXO2HiJwDxWK2QxHqK3PyJxMx+G8sp65rNQI5cj3AhnfWjZZ8 VRRq+6UY2r77Yc/cxSB7162NXxhjds4wXV3eFqEAW6A+vvjl MIME-Version: 1.0 X-Received: by 2002:a24:ca:: with SMTP id 193-v6mr134003ita.45.1535403842497; Mon, 27 Aug 2018 14:04:02 -0700 (PDT) Date: Mon, 27 Aug 2018 14:04:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000009e76240574711017@google.com> Subject: WARNING: ODEBUG bug in f2fs_fill_super From: syzbot To: jaegeuk@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, yuchao0@huawei.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: e27bc174c9c6 Add linux-next specific files for 20180824 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=11c0034a400000 kernel config: https://syzkaller.appspot.com/x/.config?x=28446088176757ea dashboard link: https://syzkaller.appspot.com/bug?extid=77ea19d309d4cdc55cc1 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+77ea19d309d4cdc55cc1@syzkaller.appspotmail.com ------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: percpu_counter hint: (null) WARNING: CPU: 1 PID: 18832 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 lib/debugobjects.c:326 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 18832 Comm: syz-executor4 Not tainted 4.18.0-next-20180824+ #47 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 panic+0x238/0x4e7 kernel/panic.c:184 __warn.cold.8+0x163/0x1ba kernel/panic.c:536 report_bug+0x252/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:996 RIP: 0010:debug_print_object+0x16a/0x210 lib/debugobjects.c:326 Code: 3a 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd 20 e5 3a 87 4c 89 f6 48 c7 c7 c0 da 3a 87 e8 26 ec e3 fd <0f> 0b 83 05 a9 49 28 05 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffff8801a9a97360 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffc90012037000 RDX: 000000000002cd2b RSI: ffffffff8163b051 RDI: 0000000000000001 RBP: ffff8801a9a973a0 R08: ffff8801c1f76100 R09: ffffed003b623eca R10: ffffed003b623eca R11: ffff8801db11f657 R12: 0000000000000001 R13: ffffffff882b7ae0 R14: ffffffff873adf60 R15: 0000000000000000 __debug_check_no_obj_freed lib/debugobjects.c:786 [inline] debug_check_no_obj_freed+0x3b2/0x595 lib/debugobjects.c:818 kfree+0xc7/0x210 mm/slab.c:3812 f2fs_fill_super+0xe1a/0x8150 fs/f2fs/super.c:3147 mount_bdev+0x314/0x3e0 fs/super.c:1347 f2fs_mount+0x3c/0x50 fs/f2fs/super.c:3161 legacy_get_tree+0x131/0x460 fs/fs_context.c:732 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1746 do_new_mount fs/namespace.c:2627 [inline] do_mount+0x6f9/0x1e30 fs/namespace.c:2951 ksys_mount+0x12d/0x140 fs/namespace.c:3167 __do_sys_mount fs/namespace.c:3181 [inline] __se_sys_mount fs/namespace.c:3178 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3178 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459aba Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 bd 8a fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 9a 8a fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f16f9937a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f16f9937b30 RCX: 0000000000459aba RDX: 00007f16f9937ad0 RSI: 0000000020000100 RDI: 00007f16f9937af0 RBP: 0000000020000100 R08: 00007f16f9937b30 R09: 00007f16f9937ad0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 0000000000000000 R14: 00000000004c9c12 R15: 0000000000000000 ====================================================== WARNING: possible circular locking dependency detected 4.18.0-next-20180824+ #47 Not tainted ------------------------------------------------------ syz-executor4/18832 is trying to acquire lock: 00000000cd8e7eb7 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: 0000000046ad1dd4 (&obj_hash[i].lock){-.-.}, at: __debug_check_no_obj_freed lib/debugobjects.c:777 [inline] 0000000046ad1dd4 (&obj_hash[i].lock){-.-.}, at: debug_check_no_obj_freed+0x16c/0x595 lib/debugobjects.c:818 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&obj_hash[i].lock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152 __debug_object_init+0x127/0x12e0 lib/debugobjects.c:384 debug_object_init+0x16/0x20 lib/debugobjects.c:432 debug_hrtimer_init kernel/time/hrtimer.c:410 [inline] debug_init kernel/time/hrtimer.c:458 [inline] hrtimer_init+0x97/0x410 kernel/time/hrtimer.c:1308 init_dl_task_timer+0x1b/0x50 kernel/sched/deadline.c:1057 __sched_fork+0x2ae/0x590 kernel/sched/core.c:2160 init_idle+0x75/0x740 kernel/sched/core.c:5377 sched_init+0xbee/0xcbd kernel/sched/core.c:6060 start_kernel+0x47d/0x94e init/main.c:602 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 -> #2 (&rq->lock){-.-.}: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 rq_lock kernel/sched/sched.h:1821 [inline] task_fork_fair+0x93/0x680 kernel/sched/fair.c:9574 sched_fork+0x44b/0xbd0 kernel/sched/core.c:2353 copy_process+0x235e/0x7af0 kernel/fork.c:1840 _do_fork+0x1ca/0x1170 kernel/fork.c:2169 kernel_thread+0x34/0x40 kernel/fork.c:2228 rest_init+0x22/0xe4 init/main.c:408 start_kernel+0x913/0x94e init/main.c:739 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 -> #1 (&p->pi_lock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152 try_to_wake_up+0xd2/0x1250 kernel/sched/core.c:1960 wake_up_process+0x10/0x20 kernel/sched/core.c:2123 __up.isra.1+0x1c0/0x2a0 kernel/locking/semaphore.c:262 up+0x13c/0x1c0 kernel/locking/semaphore.c:187 __up_console_sem+0xbe/0x1b0 kernel/printk/printk.c:245 console_unlock+0x506/0x10d0 kernel/printk/printk.c:2430 con_install+0x34e/0x420 drivers/tty/vt/vt.c:3241 tty_driver_install_tty drivers/tty/tty_io.c:1224 [inline] tty_init_dev+0xfd/0x460 drivers/tty/tty_io.c:1324 tty_open_by_driver drivers/tty/tty_io.c:1959 [inline] tty_open+0x692/0xb30 drivers/tty/tty_io.c:2007 chrdev_open+0x25a/0x770 fs/char_dev.c:417 do_dentry_open+0x49c/0x1140 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12fb/0x5300 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x584/0x720 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 ((console_sem).lock){-.-.}: lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:228 console_trylock+0x15/0xa0 kernel/printk/printk.c:2249 console_trylock_spinning kernel/printk/printk.c:1651 [inline] vprintk_emit+0x31f/0x910 kernel/printk/printk.c:1926 vprintk_default+0x28/0x30 kernel/printk/printk.c:1968 vprintk_func+0x7a/0x117 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:2001 __warn_printk+0x8c/0xe0 kernel/panic.c:590 debug_print_object+0x16a/0x210 lib/debugobjects.c:326 __debug_check_no_obj_freed lib/debugobjects.c:786 [inline] debug_check_no_obj_freed+0x3b2/0x595 lib/debugobjects.c:818 kfree+0xc7/0x210 mm/slab.c:3812 f2fs_fill_super+0xe1a/0x8150 fs/f2fs/super.c:3147 mount_bdev+0x314/0x3e0 fs/super.c:1347 f2fs_mount+0x3c/0x50 fs/f2fs/super.c:3161 legacy_get_tree+0x131/0x460 fs/fs_context.c:732 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1746 do_new_mount fs/namespace.c:2627 [inline] do_mount+0x6f9/0x1e30 fs/namespace.c:2951 ksys_mount+0x12d/0x140 fs/namespace.c:3167 __do_sys_mount fs/namespace.c:3181 [inline] __se_sys_mount fs/namespace.c:3178 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3178 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: (console_sem).lock --> &rq->lock --> &obj_hash[i].lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&obj_hash[i].lock); lock(&rq->lock); lock(&obj_hash[i].lock); lock((console_sem).lock); *** DEADLOCK *** 2 locks held by syz-executor4/18832: #0: 000000002b55bbcc (&fc->fs_type->s_umount_key#49/1){+.+.}, at: alloc_super+0x25e/0xb20 fs/super.c:225 #1: 0000000046ad1dd4 (&obj_hash[i].lock){-.-.}, at: __debug_check_no_obj_freed lib/debugobjects.c:777 [inline] #1: 0000000046ad1dd4 (&obj_hash[i].lock){-.-.}, at: debug_check_no_obj_freed+0x16c/0x595 lib/debugobjects.c:818 stack backtrace: CPU: 1 PID: 18832 Comm: syz-executor4 Not tainted 4.18.0-next-20180824+ #47 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_circular_bug.isra.34.cold.55+0x1bd/0x27d kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1862 [inline] check_prevs_add kernel/locking/lockdep.c:1975 [inline] validate_chain kernel/locking/lockdep.c:2416 [inline] __lock_acquire+0x3449/0x5020 kernel/locking/lockdep.c:3412 lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:228 console_trylock+0x15/0xa0 kernel/printk/printk.c:2249 console_trylock_spinning kernel/printk/printk.c:1651 [inline] vprintk_emit+0x31f/0x910 kernel/printk/printk.c:1926 vprintk_default+0x28/0x30 kernel/printk/printk.c:1968 vprintk_func+0x7a/0x117 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:2001 __warn_printk+0x8c/0xe0 kernel/panic.c:590 debug_print_object+0x16a/0x210 lib/debugobjects.c:326 __debug_check_no_obj_freed lib/debugobjects.c:786 [inline] debug_check_no_obj_freed+0x3b2/0x595 lib/debugobjects.c:818 kfree+0xc7/0x210 mm/slab.c:3812 f2fs_fill_super+0xe1a/0x8150 fs/f2fs/super.c:3147 mount_bdev+0x314/0x3e0 fs/super.c:1347 f2fs_mount+0x3c/0x50 fs/f2fs/super.c:3161 legacy_get_tree+0x131/0x460 fs/fs_context.c:732 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1746 do_new_mount fs/namespace.c:2627 [inline] do_mount+0x6f9/0x1e30 fs/namespace.c:2951 ksys_mount+0x12d/0x140 fs/namespace.c:3167 __do_sys_mount fs/namespace.c:3181 [inline] __se_sys_mount fs/namespace.c:3178 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3178 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459aba Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 bd 8a fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 9a 8a fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f16f9937a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f16f9937b30 RCX: 0000000000459aba RDX: 00007f16f9937ad0 RSI: 0000000020000100 RDI: 00007f16f9937af0 RBP: 0000000020000100 R08: 00007f16f9937b30 R09: 00007f16f9937ad0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 0000000000000000 R14: 00000000004c9c12 R15: 0000000000000000 Dumping ftrace buffer: --------------------------------- syz-exec-23595 1...2 1079757271us : 0: }D syz-exec-23595 1..s3 1079757464us : 0: }D --------------------------------- Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a bot. 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