INFO: task syz-executor3:11166 blocked for more than 140 seconds.
Not tainted 4.19.0+ #300
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3 D23336 11166 5432 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x8cf/0x21d0 kernel/sched/core.c:3474
schedule+0xfe/0x460 kernel/sched/core.c:3518
__rwsem_down_write_failed_common+0xc9a/0x15e0 kernel/locking/rwsem-xadd.c:577
rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117
__down_write arch/x86/include/asm/rwsem.h:142 [inline]
down_write+0xa5/0x130 kernel/locking/rwsem.c:72
inode_lock include/linux/fs.h:738 [inline]
chmod_common+0x1b1/0x590 fs/open.c:535
do_fchmodat+0xc3/0x160 fs/open.c:579
__do_sys_chmod fs/open.c:597 [inline]
__se_sys_chmod fs/open.c:595 [inline]
__x64_sys_chmod+0x5c/0x80 fs/open.c:595
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: 83 c4 18 c3 e8 d8 64 00 00 48 8b 04 24 48 8b 4c 24 08 48 89 01 e8 d7 2d fc ff e8 22 7a fc ff b8 02 00 00 00 48 8d 0d 2a 60 09 <01> 87 01 8b 05 22 60 09 01 83 f8 01 0f 85 8a 00 00 00 b8 01 00 00
RSP: 002b:00007f65bd1bac78 EFLAGS: 00000246 ORIG_RAX: 000000000000005a
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 00000000ffffff8c RDI: 00000000200006c0
RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f65bd1bb6d4
R13: 00000000004bd325 R14: 00000000004cc388 R15: 00000000ffffffff
Showing all locks held in the system:
1 lock held by khungtaskd/978:
#0: 0000000005bcbe5f (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379
1 lock held by rsyslogd/5254:
#0: 000000009ce9038f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766
2 locks held by getty/5343:
#0: 000000003057b348 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000ca8c1b03 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5344:
#0: 000000004e569156 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000009d2fecb7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5345:
#0: 000000006be7578f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000f7552461 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5346:
#0: 00000000fce3a94d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000b5e85d0f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5347:
#0: 000000000a17480a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000019aebb1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5348:
#0: 00000000df98e046 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000350d3059 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5349:
#0: 00000000dd02ac37 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 0000000079065352 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor3/11154:
#0: 00000000e54a35a3 (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1566 [inline]
#0: 00000000e54a35a3 (sb_writers#14){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360
#1: 000000007717bddb (&sb->s_type->i_mutex_key#22){+.+.}, at: inode_lock include/linux/fs.h:738 [inline]
#1: 000000007717bddb (&sb->s_type->i_mutex_key#22){+.+.}, at: chmod_common+0x1b1/0x590 fs/open.c:535
2 locks held by syz-executor3/11166:
#0: 00000000e54a35a3 (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1566 [inline]
#0: 00000000e54a35a3 (sb_writers#14){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360
#1: 000000007717bddb (&sb->s_type->i_mutex_key#22){+.+.}, at: inode_lock include/linux/fs.h:738 [inline]
#1: 000000007717bddb (&sb->s_type->i_mutex_key#22){+.+.}, at: chmod_common+0x1b1/0x590 fs/open.c:535
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 978 Comm: khungtaskd Not tainted 4.19.0+ #300
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+0x244/0x39d lib/dump_stack.c:113
nmi_cpu_backtrace.cold.1+0x5c/0xa1 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b3/0x1ed lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
watchdog+0xb3e/0x1050 kernel/hung_task.c:265
kthread+0x35a/0x420 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:350
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:57