Hello, a customer reports the below reproducible locking splat when booting with nfsroot and changing a password: On Tue, Jun 19, 2018 at 10:30:28AM +0000, said customer wrote: > root@hostname:~ uname -a > Linux hostame 4.17.0-20180520-1-g248646e6c511 #3 SMP 2018-05-01 armv7l GNU/Linux > > root@hostname:~ passwd > Changing password for root > New password: > Bad password: too short > Retype password: > [ 31.945836] ------------[ cut here ]------------ > [ 31.950545] WARNING: CPU: 1 PID: 74 at kernel/locking/rwsem.c:217 up_read_non_owner+0xb4/0xb8 > [ 31.959079] DEBUG_LOCKS_WARN_ON(sem->owner != ((struct task_struct *)(1UL << 0))) > [ 31.959085] Modules linked in: > [ 31.969836] CPU: 1 PID: 74 Comm: kworker/1:3 Not tainted 4.17.0-20180520-1-g248646e6c511 #3 > [ 31.978201] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) > [ 31.984776] Workqueue: nfsiod rpc_async_release > [ 31.989348] Backtrace: > [ 31.991851] [<8010f404>] (dump_backtrace) from [<8010f6ac>] (show_stack+0x20/0x24) > [ 31.999456] r7:810ae570 r6:00000000 r5:60070013 r4:810ae570 > [ 32.005155] [<8010f68c>] (show_stack) from [<80b78638>] (dump_stack+0xb0/0xdc) > [ 32.012428] [<80b78588>] (dump_stack) from [<80126240>] (__warn+0x100/0x11c) > [ 32.019513] r10:be161ef8 r9:000000d9 r8:8017ede0 r7:00000009 r6:80e014ec r5:00000000 > [ 32.027370] r4:be161e50 r3:bf7cfa58 > [ 32.038506] r9:810b64f0 r8:81007528 r7:bf7d8e00 r6:bde27000 r5:bdade600 r4:80dfd978 > [ 32.046295] [<80126260>] (warn_slowpath_fmt) from [<8017ede0>] (up_read_non_owner+0xb4/0xb8) > [ 32.054761] r3:80e014b8 r2:80dfd978 > [ 32.058361] r4:bec40cc8 > [ 32.060945] [<8017ed2c>] (up_read_non_owner) from [<803e8020>] (nfs_async_unlink_release+0x30/0x78) > [ 32.070018] r5:bdade600 r4:bd697730 > [ 32.073637] [<803e7ff0>] (nfs_async_unlink_release) from [<80a6d08c>] (rpc_free_task+0x34/0x54) > [ 32.082368] r7:bf7d8e00 r6:bf7d2ec0 r5:00000881 r4:bd81dcc0 > [ 32.088067] [<80a6d058>] (rpc_free_task) from [<80a6d0c8>] (rpc_async_release+0x1c/0x20) > [ 32.096185] r5:be118d80 r4:bd81dce4 > [ 32.099803] [<80a6d0ac>] (rpc_async_release) from [<80146298>] (process_one_work+0x2b4/0x7d4) > [ 32.108366] [<80145fe4>] (process_one_work) from [<8014752c>] (worker_thread+0x64/0x5bc) > [ 32.116490] r10:81004900 r9:00000008 r8:ffffe000 r7:bf7d2ef4 r6:be118d98 r5:bf7d2ec0 > [ 32.124345] r4:be118d80 > [ 32.126919] [<801474c8>] (worker_thread) from [<8014df28>] (kthread+0x174/0x178) > [ 32.134350] r10:bf15be74 r9:801474c8 r8:be118d80 r7:be160000 r6:00000000 r5:be11ed00 > [ 32.142207] r4:be0b1e80 > [ 32.144778] [<8014ddb4>] (kthread) from [<801010b4>] (ret_from_fork+0x14/0x20) > [ 32.152027] Exception stack(0xbe161fb0 to 0xbe161ff8) > [ 32.157110] 1fa0: 00000000 00000000 00000000 00000000 > [ 32.165321] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > [ 32.173531] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 > [ 32.180179] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8014ddb4 > [ 32.188033] r4:be11ed00 > [ 32.190810] irq event stamp: 16391 > [ 32.194282] hardirqs last enabled at (16391): [<80b965bc>] _raw_spin_unlock_irq+0x34/0x3c > [ 32.202707] hardirqs last disabled at (16390): [<80b9648c>] _raw_spin_lock_irq+0x28/0x58 > [ 32.210881] softirqs last enabled at (7494): [<801a1258>] srcu_invoke_callbacks+0xa4/0x150 > [ 32.219279] softirqs last disabled at (7490): [<801a1258>] srcu_invoke_callbacks+0xa4/0x150 > [ 32.227704] ---[ end trace 57db2425555c8696 ]--- > passwd: password for root changed by root this happens since they upgraded to 4.17, it was bisected to 5149cbac4235e12a34cf089592a8bd1c9fcfa467, which isn't very helpful though. Before I start investigating this issue, I'd like to know if you are maybe already aware of this problem to prevent duplicate work. Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ | -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
