Hello,
syzbot found the following crash on:
HEAD commit: 47bbcd6b ANDROID: Fix massive cpufreq_times memory leaks
git tree: android-4.9
console output:
https://syzkaller.appspot.com/x/log.txt?x=131f0768400000
kernel config:
https://syzkaller.appspot.com/x/.config?x=f2dbd0c9dd968786
dashboard link:
https://syzkaller.appspot.com/bug?extid=40cf3cb694024c867daf
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro:
https://syzkaller.appspot.com/x/repro.syz?x=13fda978400000
C reproducer:
https://syzkaller.appspot.com/x/repro.c?x=16d1c658400000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by:
syzbot+40cf3c...@syzkaller.appspotmail.com
binder: 13899:13899 transaction failed 29189/-22, size 24-8 line 3013
binder: 13900:13900 transaction failed 29189/-22, size 24-8 line 3013
binder: 13901:13901 transaction failed 29189/-22, size 24-8 line 3013
binder: 13902:13902 transaction failed 29189/-22, size 24-8 line 3013
binder: 13903:13903 transaction failed 29189/-22, size 24-8 line 3013
INFO: task init:5690 blocked for more than 140 seconds.
Not tainted 4.9.113-g47bbcd6 #10
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init D27736 5690 1 0x00000000
ffff8801cc7d1800 0000000000000000 ffff8801cc6e64c0 ffff8801d9a39800
ffff8801db221c18 ffff8801ccb17570 ffffffff839e909d 0000000000000000
ffff8801cc7d20ea ffff8801ccb176d0 0000000000000046 ffff8801db2224e8
Call Trace:
[<ffffffff839ea69f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
[<ffffffff839f6ab1>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
[<ffffffff839f31ce>] __down_common kernel/locking/semaphore.c:221 [inline]
[<ffffffff839f31ce>] __down+0x12e/0x1f0 kernel/locking/semaphore.c:238
[<ffffffff8122bd4e>] down+0x5e/0x80 kernel/locking/semaphore.c:61
[<ffffffff8125a62c>] console_lock+0x2c/0x80 kernel/printk/printk.c:2212
[<ffffffff8125fe9c>] console_device+0x1c/0xc0 kernel/printk/printk.c:2549
[<ffffffff821194da>] tty_lookup_driver drivers/tty/tty_io.c:2003 [inline]
[<ffffffff821194da>] tty_open_by_driver drivers/tty/tty_io.c:2048 [inline]
[<ffffffff821194da>] tty_open+0x71a/0xe20 drivers/tty/tty_io.c:2125
[<ffffffff8157ee6d>] chrdev_open+0x22d/0x4c0 fs/char_dev.c:392
[<ffffffff81569d53>] do_dentry_open+0x703/0xc80 fs/open.c:766
[<ffffffff8156d53c>] vfs_open+0x11c/0x210 fs/open.c:879
[<ffffffff815a4678>] do_last fs/namei.c:3410 [inline]
[<ffffffff815a4678>] path_openat+0x758/0x3590 fs/namei.c:3534
[<ffffffff815ab777>] do_filp_open+0x197/0x270 fs/namei.c:3568
[<ffffffff8156df4d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
[<ffffffff8156e22d>] SYSC_open fs/open.c:1090 [inline]
[<ffffffff8156e22d>] SyS_open+0x2d/0x40 fs/open.c:1085
[<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
[<ffffffff839f9f93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Showing all locks held in the system:
2 locks held by khungtaskd/519:
#0: (rcu_read_lock){......}, at: [<ffffffff8136675c>]
check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
#0: (rcu_read_lock){......}, at: [<ffffffff8136675c>]
watchdog+0x11c/0xa20 kernel/hung_task.c:239
#1: (tasklist_lock){.+.+..}, at: [<ffffffff81425de7>]
debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3673:
#0: (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d81ec>]
__fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3769:
#0: (&tty->ldisc_sem){++++++}, at: [<ffffffff839f8142>]
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
#1: (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211ee22>]
n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by init/5690:
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver
drivers/tty/tty_io.c:2047 [inline]
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20
drivers/tty/tty_io.c:2125
1 lock held by init/5693:
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver
drivers/tty/tty_io.c:2047 [inline]
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20
drivers/tty/tty_io.c:2125
1 lock held by init/5696:
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver
drivers/tty/tty_io.c:2047 [inline]
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20
drivers/tty/tty_io.c:2125
1 lock held by init/5697:
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver
drivers/tty/tty_io.c:2047 [inline]
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20
drivers/tty/tty_io.c:2125
1 lock held by init/5700:
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver
drivers/tty/tty_io.c:2047 [inline]
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20
drivers/tty/tty_io.c:2125
1 lock held by init/5701:
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open_by_driver
drivers/tty/tty_io.c:2047 [inline]
#0: (tty_mutex){+.+.+.}, at: [<ffffffff8211922c>] tty_open+0x46c/0xe20
drivers/tty/tty_io.c:2125
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.113-g47bbcd6 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
ffff8801d864fd08 ffffffff81eb32a9 0000000000000000 0000000000000001
0000000000000001
binder: 13904:13904 transaction failed 29189/-22, size 24-8 line 3013
0000000000000001 ffffffff810b9bd0 ffff8801d864fd40
Call Trace:
[<ffffffff81eb32a9>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81eb32a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
[<ffffffff81ebe5a7>] nmi_cpu_backtrace.cold.2+0x48/0x87
lib/nmi_backtrace.c:99
[<ffffffff81ebe53a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f
lib/nmi_backtrace.c:60
[<ffffffff810b9cd4>] arch_trigger_cpumask_backtrace+0x14/0x20
arch/x86/kernel/apic/hw_nmi.c:37
[<ffffffff81366cf4>] trigger_all_cpu_backtrace include/linux/nmi.h:58
[inline]
[<ffffffff81366cf4>] check_hung_task kernel/hung_task.c:125 [inline]
[<ffffffff81366cf4>] check_hung_uninterruptible_tasks
kernel/hung_task.c:182 [inline]
[<ffffffff81366cf4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
[<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
[<ffffffff839fa15c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 13904 Comm: syz-executor192 Not tainted 4.9.113-g47bbcd6 #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
task: ffff880198406000 task.stack: ffff88018e0f8000
RIP: 0010:[<ffffffff81236bcf>] c [<ffffffff81236bcf>]
__lock_acquire+0xa1f/0x4070 kernel/locking/lockdep.c:3224
RSP: 0018:ffff88018e0ff430 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 1ffffffff0b7bc8c RSI: 0000000000000000 RDI: ffffffff85bde460
RBP: ffff88018e0ff5d8 R08: 0000000000000001 R09: 0000000000000001
R10: ffff880198406000 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: ffffffff85bde460 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006d1090 CR3: 000000000461e000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
ffffffff812361b0 c ffff88018e0ff460 c ffffffff8122bcd0 c 0000000000000006 c
ffffffff855891b0 c ffffffff8125f493 c 0000000000000ff8 c ffff8801984068e0 c
ffff8801984068b8 c ffff8801984068e8 c ffffffff855891b0 c ffff8801984068c8 c
Call Trace:
[<ffffffff8123ac90>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
[<ffffffff839f9ebe>] __raw_spin_lock_irqsave
include/linux/spinlock_api_smp.h:112 [inline]
[<ffffffff839f9ebe>] _raw_spin_lock_irqsave+0x4e/0x62
kernel/locking/spinlock.c:159
[<ffffffff81f1dd74>] __debug_check_no_obj_freed lib/debugobjects.c:711
[inline]
[<ffffffff81f1dd74>] debug_check_no_obj_freed+0x164/0x930
lib/debugobjects.c:749
[<ffffffff8144a49d>] free_pages_prepare mm/page_alloc.c:1073 [inline]
[<ffffffff8144a49d>] __free_pages_ok+0x1dd/0x1610 mm/page_alloc.c:1275
[<ffffffff8144b92e>] free_compound_page+0x5e/0x70 mm/page_alloc.c:606
[<ffffffff81551ce9>] free_transhuge_page+0x99/0xc0 mm/huge_memory.c:2229
[<ffffffff81463d30>] __put_compound_page+0x80/0xc0 mm/swap.c:94
[<ffffffff81465924>] release_pages+0x2f4/0x970 mm/swap.c:763
[<ffffffff81508b47>] free_pages_and_swap_cache+0x117/0x160
mm/swap_state.c:273
[<ffffffff814c00d4>] tlb_flush_mmu_free+0xb4/0x150 mm/memory.c:259
[<ffffffff814c850d>] zap_pte_range mm/memory.c:1216 [inline]
[<ffffffff814c850d>] zap_pmd_range mm/memory.c:1258 [inline]
[<ffffffff814c850d>] zap_pud_range mm/memory.c:1279 [inline]
[<ffffffff814c850d>] unmap_page_range+0x104d/0x1730 mm/memory.c:1300
[<ffffffff814c8cf1>] unmap_single_vma+0x101/0x260 mm/memory.c:1345
[<ffffffff814c9632>] unmap_vmas+0x102/0x1d0 mm/memory.c:1375
[<ffffffff814e1d94>] exit_mmap+0x214/0x3f0 mm/mmap.c:3020
[<ffffffff8112bff3>] __mmput kernel/fork.c:881 [inline]
[<ffffffff8112bff3>] mmput+0xf3/0x2d0 kernel/fork.c:903
[<ffffffff81140de6>] exit_mm kernel/exit.c:514 [inline]
[<ffffffff81140de6>] do_exit+0x906/0x27b0 kernel/exit.c:820
[<ffffffff81146fa1>] do_group_exit+0x111/0x340 kernel/exit.c:937
[<ffffffff811471ed>] SYSC_exit_group kernel/exit.c:948 [inline]
[<ffffffff811471ed>] SyS_exit_group+0x1d/0x20 kernel/exit.c:946
[<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
[<ffffffff839f9f93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: c00 c0f c85 c17 c27 c00 c00 c48 c8d c65 cd8 c5b c41 c5c
c41 c5d c41 c5e c41 c5f c5d cc3 c48 cb8 c00 c00 c00 c00 c00
cfc cff cdf c4c c89 cf2 c48 cc1 cea c03 c80 c3c c02 c00
c<0f> c85 c51 c27 c00 c00 c49 c81 c3e ca0 c8c ce9 c84 c0f
c84 c08 cf7 cff cff c83 cfe c
---
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