Hi, The following soft lockup occurs when fstests' ext4/303 test is executed with 64k block size on a ppc64 machine running linux-4.8 kernel. NMI watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [fio:12268] Modules linked in: CPU: 1 PID: 12268 Comm: fio Not tainted 4.8.0 #1 task: c00000062d344900 task.stack: c0000006283c4000 NIP: c0000000003a55e4 LR: c0000000003a5564 CTR: 0000000000000000 REGS: c0000006283c6fb0 TRAP: 0901 Not tainted (4.8.0) MSR: 8000000002009032 <SF,VEC,EE,ME,IR,DR,RI> CR: 44428848 XER: 00000000 CFAR: c0000000003a5670 SOFTE: 1 GPR00: c0000000003a79cc c0000006283c7230 c00000000110f100 0000000000008010 GPR04: 0000000000000000 c000000630fd7000 fffffffffffffffe 0000000000000010 GPR08: 0000000000008010 ffffffffffffffff 000000000000000f 0000000081860c2d GPR12: 0000000024428244 c00000000fe00400 NIP [c0000000003a55e4] .ext4_mb_generate_buddy+0x1a4/0x450 LR [c0000000003a5564] .ext4_mb_generate_buddy+0x124/0x450 Call Trace: [c0000006283c7230] [0000000000000002] 0x2 (unreliable) [c0000006283c7340] [c0000000003a79cc] .ext4_mb_init_cache+0x43c/0x830 [c0000006283c7470] [c0000000003a8040] .ext4_mb_init_group+0x280/0x350 [c0000006283c7540] [c0000000003a8340] .ext4_mb_good_group+0x230/0x240 [c0000006283c75e0] [c0000000003abf8c] .ext4_mb_regular_allocator+0x2ec/0x540 [c0000006283c7720] [c0000000003ae1c0] .ext4_mb_new_blocks+0x680/0xd80 [c0000006283c7820] [c00000000039ee98] .ext4_ext_map_blocks+0x758/0x1d20 [c0000006283c79d0] [c000000000365e24] .ext4_map_blocks+0x1c4/0x750 [c0000006283c7ab0] [c000000000399230] .ext4_alloc_file_blocks.isra.6+0x170/0x3e0 [c0000006283c7be0] [c0000000003a1e24] .ext4_fallocate+0x2f4/0xa20 [c0000006283c7cf0] [c000000000283f54] .vfs_fallocate+0x144/0x290 [c0000006283c7d90] [c000000000285298] .SyS_fallocate+0x58/0xd0 [c0000006283c7e30] [c000000000009560] system_call+0x38/0x108 Instruction dump: 889e0014 7f042030 5484043e 7e892378 7d2907b4 7d4900d0 7d494838 7d070034 7d290074 2147001f 2129003f 7f895000 <409d0008> 7d495378 7d2a07b4 2e890000 -- chandan -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
