Date:   Wed, 16 Jan 2019 18:33:04 -0800
From:   syzbot <syzbot+80dd4798c16c634daf15@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, iamjoonsoo.kim@....com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        mgorman@...hsingularity.net, mhocko@...e.com, sfr@...b.auug.org.au,
        syzkaller-bugs@...glegroups.com, vbabka@...e.cz
Subject: kernel BUG at mm/page_alloc.c:LINE!

Hello,

syzbot found the following crash on:

HEAD commit:    b808822a75a3 Add linux-next specific files for 20190111
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16a471d8c00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c052ead0aed5001b
dashboard link: https://syzkaller.appspot.com/bug?extid=80dd4798c16c634daf15
compiler:       gcc (GCC) 9.0.0 20181231 (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+80dd4798c16c634daf15@...kaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at mm/page_alloc.c:3112!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1043 Comm: kcompactd0 Not tainted 5.0.0-rc1-next-20190111 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:__isolate_free_page+0x4a8/0x680 mm/page_alloc.c:3112
Code: 4c 39 e3 77 c0 0f b6 8d 74 ff ff ff b8 01 00 00 00 48 d3 e0 e9 11 fd  
ff ff 48 c7 c6 a0 63 52 88 4c 89 e7 e8 6a 14 10 00 0f 0b <0f> 0b 48 c7 c6  
c0 64 52 88 4c 89 e7 e8 57 14 10 00 0f 0b 48 89 cf
RSP: 0000:ffff8880a78e6f58 EFLAGS: 00010007
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88812fffc7e0
RDX: 1ffff11025fff8fc RSI: 0000000000000007 RDI: ffff88812fffc7b0
RBP: ffff8880a78e7018 R08: ffff8880a78ce000 R09: ffffed1014f1cdf2
R10: ffffed1014f1cdf1 R11: 0000000000000003 R12: ffff88812fffc7b0
R13: 1ffff11014f1cdf2 R14: ffff88812fffc7b0 R15: ffff8880a78e6ff0
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000438ca0 CR3: 0000000009871000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
  fast_isolate_freepages mm/compaction.c:1356 [inline]
  isolate_freepages mm/compaction.c:1429 [inline]
  compaction_alloc+0xd05/0x2970 mm/compaction.c:1541
  unmap_and_move mm/migrate.c:1177 [inline]
  migrate_pages+0x48e/0x2cc0 mm/migrate.c:1417
  compact_zone+0x2207/0x3e90 mm/compaction.c:2173
  kcompactd_do_work+0x6de/0x1200 mm/compaction.c:2564
  kcompactd+0x251/0x970 mm/compaction.c:2657
  kthread+0x357/0x430 kernel/kthread.c:247
  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Modules linked in:

======================================================
WARNING: possible circular locking dependency detected
5.0.0-rc1-next-20190111 #10 Not tainted
------------------------------------------------------
kcompactd0/1043 is trying to acquire lock:
00000000a0848583 (console_owner){-.-.}, at: log_next  
kernel/printk/printk.c:499 [inline]
00000000a0848583 (console_owner){-.-.}, at: console_unlock+0x4ac/0x1040  
kernel/printk/printk.c:2442

but task is already holding lock:
00000000c8e67de2 (&(&zone->lock)->rlock){..-.}, at: fast_isolate_freepages  
mm/compaction.c:1313 [inline]
00000000c8e67de2 (&(&zone->lock)->rlock){..-.}, at: isolate_freepages  
mm/compaction.c:1429 [inline]
00000000c8e67de2 (&(&zone->lock)->rlock){..-.}, at:  
compaction_alloc+0x6f3/0x2970 mm/compaction.c:1541

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&(&zone->lock)->rlock){..-.}:
        __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
        _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
        rmqueue mm/page_alloc.c:3253 [inline]
        get_page_from_freelist+0xf6c/0x4870 mm/page_alloc.c:3668
        __alloc_pages_nodemask+0x4fd/0xdc0 mm/page_alloc.c:4714
        alloc_pages_current+0x107/0x210 mm/mempolicy.c:2106
        alloc_pages include/linux/gfp.h:509 [inline]
        depot_save_stack+0x3da/0x460 lib/stackdepot.c:260
        save_stack+0xa9/0xd0 mm/kasan/common.c:79
        set_track mm/kasan/common.c:85 [inline]
        __kasan_kmalloc mm/kasan/common.c:496 [inline]
        __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469
        kasan_kmalloc mm/kasan/common.c:504 [inline]
        kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411
        slab_post_alloc_hook mm/slab.h:440 [inline]
        slab_alloc mm/slab.c:3381 [inline]
        __do_kmalloc mm/slab.c:3709 [inline]
        __kmalloc+0x145/0x740 mm/slab.c:3720
        kmalloc include/linux/slab.h:550 [inline]
        tty_buffer_alloc drivers/tty/tty_buffer.c:175 [inline]
        __tty_buffer_request_room+0x2bf/0x7e0 drivers/tty/tty_buffer.c:273
        tty_insert_flip_string_fixed_flag+0x93/0x1f0  
drivers/tty/tty_buffer.c:318
        tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
        pty_write+0x133/0x200 drivers/tty/pty.c:122
        tty_put_char+0x137/0x160 drivers/tty/tty_io.c:3022
        __process_echoes+0x5c8/0xa40 drivers/tty/n_tty.c:726
        flush_echoes drivers/tty/n_tty.c:827 [inline]
        __receive_buf drivers/tty/n_tty.c:1646 [inline]
        n_tty_receive_buf_common+0xc2c/0x2f30 drivers/tty/n_tty.c:1740
        n_tty_receive_buf2+0x34/0x40 drivers/tty/n_tty.c:1775
        tty_ldisc_receive_buf+0xaf/0x1c0 drivers/tty/tty_buffer.c:461
        tty_port_default_receive_buf+0x114/0x190 drivers/tty/tty_port.c:38
        receive_buf drivers/tty/tty_buffer.c:481 [inline]
        flush_to_ldisc+0x3b2/0x590 drivers/tty/tty_buffer.c:533
        process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153
        worker_thread+0x143/0x14a0 kernel/workqueue.c:2296
        kthread+0x357/0x430 kernel/kthread.c:247
        ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

-> #2 (&(&port->lock)->rlock){-.-.}:
        __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
        _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
        tty_port_tty_get+0x22/0x80 drivers/tty/tty_port.c:287
        tty_port_default_wakeup+0x16/0x40 drivers/tty/tty_port.c:47
        tty_port_tty_wakeup+0x5d/0x70 drivers/tty/tty_port.c:387
        uart_write_wakeup+0x46/0x70 drivers/tty/serial/serial_core.c:103
        serial8250_tx_chars+0x4a4/0xb20  
drivers/tty/serial/8250/8250_port.c:1806
        serial8250_handle_irq.part.0+0x1be/0x2e0  
drivers/tty/serial/8250/8250_port.c:1879
        serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1865  
[inline]
        serial8250_default_handle_irq+0xc5/0x150  
drivers/tty/serial/8250/8250_port.c:1895
        serial8250_interrupt+0xfb/0x1a0  
drivers/tty/serial/8250/8250_core.c:125
        __handle_irq_event_percpu+0x1c6/0xb10 kernel/irq/handle.c:149
        handle_irq_event_percpu+0xa0/0x1d0 kernel/irq/handle.c:189
        handle_irq_event+0xa7/0x134 kernel/irq/handle.c:206
        handle_edge_irq+0x232/0x8a0 kernel/irq/chip.c:791
        generic_handle_irq_desc include/linux/irqdesc.h:154 [inline]
        handle_irq+0x252/0x3d8 arch/x86/kernel/irq_64.c:78
        do_IRQ+0x99/0x1d0 arch/x86/kernel/irq.c:246
        ret_from_intr+0x0/0x1e
        native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:57
        arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:555
        default_idle_call+0x36/0x90 kernel/sched/idle.c:93
        cpuidle_idle_call kernel/sched/idle.c:153 [inline]
        do_idle+0x386/0x5d0 kernel/sched/idle.c:262
        cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:353
        start_secondary+0x435/0x620 arch/x86/kernel/smpboot.c:272
        secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

-> #1 (&port_lock_key){-.-.}:
        __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
        _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
        serial8250_console_write+0x253/0xab0  
drivers/tty/serial/8250/8250_port.c:3245
        univ8250_console_write+0x5f/0x70  
drivers/tty/serial/8250/8250_core.c:586
        call_console_drivers kernel/printk/printk.c:1784 [inline]
        console_unlock+0xc9a/0x1040 kernel/printk/printk.c:2455
        vprintk_emit+0x370/0x960 kernel/printk/printk.c:1978
        vprintk_default+0x28/0x30 kernel/printk/printk.c:2005
        vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
        printk+0xba/0xed kernel/printk/printk.c:2038
        register_console+0x74d/0xb50 kernel/printk/printk.c:2770
        univ8250_console_init+0x3e/0x4b  
drivers/tty/serial/8250/8250_core.c:681
        console_init+0x6b7/0x9fe kernel/printk/printk.c:2856
        start_kernel+0x5df/0x8bd init/main.c:667
        x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
        x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
        secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

-> #0 (console_owner){-.-.}:
        lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3860
        console_lock_spinning_enable kernel/printk/printk.c:1647 [inline]
        console_unlock+0x516/0x1040 kernel/printk/printk.c:2452
        vprintk_emit+0x370/0x960 kernel/printk/printk.c:1978
        vprintk_default+0x28/0x30 kernel/printk/printk.c:2005
        vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
        printk+0xba/0xed kernel/printk/printk.c:2038
        report_bug.cold+0x11/0x5e lib/bug.c:191
        fixup_bug arch/x86/kernel/traps.c:178 [inline]
        fixup_bug arch/x86/kernel/traps.c:173 [inline]
        do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
        do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
        invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
        __ClearPageBuddy include/linux/page-flags.h:706 [inline]
        rmv_page_order mm/page_alloc.c:744 [inline]
        rmv_page_order mm/page_alloc.c:742 [inline]
        __isolate_free_page+0x4a8/0x680 mm/page_alloc.c:3134
        fast_isolate_freepages mm/compaction.c:1356 [inline]
        isolate_freepages mm/compaction.c:1429 [inline]
        compaction_alloc+0xd05/0x2970 mm/compaction.c:1541
        unmap_and_move mm/migrate.c:1177 [inline]
        migrate_pages+0x48e/0x2cc0 mm/migrate.c:1417
        compact_zone+0x2207/0x3e90 mm/compaction.c:2173
        kcompactd_do_work+0x6de/0x1200 mm/compaction.c:2564
        kcompactd+0x251/0x970 mm/compaction.c:2657
        kthread+0x357/0x430 kernel/kthread.c:247
        ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

other info that might help us debug this:

Chain exists of:
   console_owner --> &(&port->lock)->rlock --> &(&zone->lock)->rlock

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock(&(&zone->lock)->rlock);
                                lock(&(&port->lock)->rlock);
                                lock(&(&zone->lock)->rlock);
   lock(console_owner);

  *** DEADLOCK ***

2 locks held by kcompactd0/1043:
  #0: 00000000c8e67de2 (&(&zone->lock)->rlock){..-.}, at:  
fast_isolate_freepages mm/compaction.c:1313 [inline]
  #0: 00000000c8e67de2 (&(&zone->lock)->rlock){..-.}, at: isolate_freepages  
mm/compaction.c:1429 [inline]
  #0: 00000000c8e67de2 (&(&zone->lock)->rlock){..-.}, at:  
compaction_alloc+0x6f3/0x2970 mm/compaction.c:1541
  #1: 0000000001912981 (console_lock){+.+.}, at: console_trylock_spinning  
kernel/printk/printk.c:1709 [inline]
  #1: 0000000001912981 (console_lock){+.+.}, at: vprintk_emit+0x351/0x960  
kernel/printk/printk.c:1977

stack backtrace:
CPU: 0 PID: 1043 Comm: kcompactd0 Not tainted 5.0.0-rc1-next-20190111 #10
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+0x1db/0x2d0 lib/dump_stack.c:113
  print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1225
  check_prev_add kernel/locking/lockdep.c:1867 [inline]
  check_prevs_add kernel/locking/lockdep.c:1980 [inline]
  validate_chain kernel/locking/lockdep.c:2351 [inline]
  __lock_acquire+0x2fed/0x4a10 kernel/locking/lockdep.c:3339
  lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3860
  console_lock_spinning_enable kernel/printk/printk.c:1647 [inline]
  console_unlock+0x516/0x1040 kernel/printk/printk.c:2452
  vprintk_emit+0x370/0x960 kernel/printk/printk.c:1978
  vprintk_default+0x28/0x30 kernel/printk/printk.c:2005
  vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
  printk+0xba/0xed kernel/printk/printk.c:2038
  report_bug.cold+0x11/0x5e lib/bug.c:191
  fixup_bug arch/x86/kernel/traps.c:178 [inline]
  fixup_bug arch/x86/kernel/traps.c:173 [inline]
  do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
  do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
  invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:__isolate_free_page+0x4a8/0x680 mm/page_alloc.c:3112
Code: 4c 39 e3 77 c0 0f b6 8d 74 ff ff ff b8 01 00 00 00 48 d3 e0 e9 11 fd  
ff ff 48 c7 c6 a0 63 52 88 4c 89 e7 e8 6a 14 10 00 0f 0b <0f> 0b 48 c7 c6  
c0 64 52 88 4c 89 e7 e8 57 14 10 00 0f 0b 48 89 cf
RSP: 0000:ffff8880a78e6f58 EFLAGS: 00010007
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88812fffc7e0
RDX: 1ffff11025fff8fc RSI: 0000000000000007 RDI: ffff88812fffc7b0
RBP: ffff8880a78e7018 R08: ffff8880a78ce000 R09: ffffed1014f1cdf2
R10: ffffed1014f1cdf1 R11: 0000000000000003 R12: ffff88812fffc7b0
R13: 1ffff11014f1cdf2 R14: ffff88812fffc7b0 R15: ffff8880a78e6ff0
  fast_isolate_freepages mm/compaction.c:1356 [inline]
  isolate_freepages mm/compaction.c:1429 [inline]
  compaction_alloc+0xd05/0x2970 mm/compaction.c:1541
  unmap_and_move mm/migrate.c:1177 [inline]
  migrate_pages+0x48e/0x2cc0 mm/migrate.c:1417
  compact_zone+0x2207/0x3e90 mm/compaction.c:2173
Lost 33 message(s)!
---[ end trace b088aebfc4c7ea50 ]---
RIP: 0010:__isolate_free_page+0x4a8/0x680 mm/page_alloc.c:3112
Code: 4c 39 e3 77 c0 0f b6 8d 74 ff ff ff b8 01 00 00 00 48 d3 e0 e9 11 fd  
ff ff 48 c7 c6 a0 63 52 88 4c 89 e7 e8 6a 14 10 00 0f 0b <0f> 0b 48 c7 c6  
c0 64 52 88 4c 89 e7 e8 57 14 10 00 0f 0b 48 89 cf
RSP: 0000:ffff8880a78e6f58 EFLAGS: 00010007
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88812fffc7e0
RDX: 1ffff11025fff8fc RSI: 0000000000000007 RDI: ffff88812fffc7b0
RBP: ffff8880a78e7018 R08: ffff8880a78ce000 R09: ffffed1014f1cdf2
R10: ffffed1014f1cdf1 R11: 0000000000000003 R12: ffff88812fffc7b0
R13: 1ffff11014f1cdf2 R14: ffff88812fffc7b0 R15: ffff8880a78e6ff0
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000438ca0 CR3: 0000000009871000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600


---
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