On 28.08.2017 13:28, Abdul Haleem wrote: > Hi, > > offlate we are seeing hung task call traces when running trinity fuzzer > test. kernel go hung and requires machine reboot. > > Machine Type : Power 8 > Kernel : 4.13.0-rc6-next-20170825 > config: Tul-VM-config > > > call traces: > ------------- > INFO: task systemd-timesyn:472 blocked for more than 120 seconds. > Not tainted 4.13.0-rc6-next-20170825 #3 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this > message. > systemd-timesyn D 0 472 1 0x00040000 > Call Trace: > [c000000775f2b750] [0000000b00000000] 0xb00000000 (unreliable) > [c000000775f2b920] [c00000000001c788] __switch_to+0x2a8/0x470 > [c000000775f2b980] [c000000000c16974] __schedule+0x394/0xa40 > [c000000775f2ba50] [c000000000c17068] schedule+0x48/0xc0 > [c000000775f2ba80] [c000000000c1b2e8] rwsem_down_read_failed+0x128/0x1b0 > [c000000775f2bae0] [c0000000001700c8] __percpu_down_read+0x108/0x110 > [c000000775f2bb10] [c00000000038fda8] __sb_start_write+0x118/0x130 > [c000000775f2bb50] [c0000000003c1768] mnt_want_write+0x38/0x80 > [c000000775f2bb80] [c0000000003a3328] path_openat+0x9c8/0x14b0 > [c000000775f2bc90] [c0000000003a579c] do_filp_open+0xfc/0x170 > [c000000775f2bdc0] [c000000000388618] do_sys_open+0x1b8/0x2e0 > [c000000775f2be30] [c00000000000b184] system_call+0x58/0x6c > INFO: task rs:main Q:Reg:624 blocked for more than 120 seconds. > Not tainted 4.13.0-rc6-next-20170825 #3 I'm in CC here, but it doesn't seem my commit 83ced169d9a0 "locking/rwsem-xadd: Add killable versions of rwsem_down_read_failed()" is involved. It introduces the code, which is unused at the moment: kirill$:~/linux-next$ git grep rwsem_down_read_failed_killable include/linux/rwsem.h:extern struct rw_semaphore *rwsem_down_read_failed_killable(struct rw_semaphore *sem); kernel/locking/rwsem-xadd.c:rwsem_down_read_failed_killable(struct rw_semaphore *sem) kernel/locking/rwsem-xadd.c:EXPORT_SYMBOL(rwsem_down_read_failed_killable); We still call rwsem_down_read_failed() with TASK_UNINTERRUPTIBLE argument, so "signal_pending_state()" branch is always dead. -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
