On 24 December 2013 19:18, Steven Rostedt <rost...@goodmis.org> wrote: > Can you also produce this with just > "echo 1 > /sys/kernel/debug/tracing/events/syscalls/enable"?
Yeah, running any command after doing above results in crash. I tried this on latest mainline: c5fdd53 Merge branch 'for-linus' of git://git.kernel.dk/linux-block with CONFIG_NO_HZ_FULL disabled. root@linaro-developer:/home/linaro# echo 1 > /sys/kernel/debug/tracing/events/syscalls/enable root@linaro-developer:/home/linaro# ls [ 158.697900] Unable to handle kernel NULL pointer dereference at virtual address 0000001b [ 158.704783] pgd = ee644000 [ 158.707321] [0000001b] *pgd=6e4f9831, *pte=00000000, *ppte=00000000 [ 158.713525] Internal error: Oops: 17 [#1] PREEMPT SMP ARM [ 158.718928] Modules linked in: [ 158.721942] CPU: 1 PID: 2004 Comm: ls Not tainted 3.13.0-rc5-00075-gd5b6a3e #142 [ 158.729372] task: ee9bf0c0 ti: ee642000 task.ti: ee642000 [ 158.734754] PC is at ftrace_syscall_enter+0x44/0x178 [ 158.739691] LR is at syscall_trace_enter+0xf8/0x144 [ 158.744539] pc : [<c00ad5dc>] lr : [<c0010f08>] psr: a0000013 [ 158.744539] sp : ee643f40 ip : ee643f80 fp : ee643f7c [ 158.756043] r10: 00000400 r9 : ee642000 r8 : c000eee4 [ 158.761203] r7 : ee643fb0 r6 : ee642000 r5 : ffffffff r4 : 000f0005 [ 158.767723] r3 : ee642000 r2 : 000f001d r1 : ee643fb0 r0 : c06cd2f8 [ 158.774236] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user [ 158.781357] Control: 10c5387d Table: 6e64406a DAC: 00000015 [ 158.787074] Process ls (pid: 2004, stack limit = 0xee642240) [ 158.792712] Stack: (0xee643f40 to 0xee644000) [ 158.797062] 3f40: ef1c4910 00000000 ee643f8c 00000022 00000003 ee961890 000f0005 ee642000 [ 158.805251] 3f60: ee643fb0 c000eee4 ee642000 00000400 ee643fa4 ee643f80 c0010f08 c00ad5a4 [ 158.813432] 3f80: b6f2e4c0 b6f2fc60 00000002 00000000 000f0005 c000eee4 00000000 ee643fa8 [ 158.821585] 3fa0: c000ee8c c0010e1c b6f2fc60 00000002 b6f2e4c0 b6f35050 b6f2ebe8 b6f2e4c0 [ 158.829744] 3fc0: b6f2fc60 00000002 00000000 000f0005 00000001 00000000 000188bc b6f35958 [ 158.837901] 3fe0: 000f0005 bed314a0 b6f168fb b6f26966 80000030 b6f2e4c0 6f7fd821 6f7fdc21 [ 158.846103] [<c00ad5dc>] (ftrace_syscall_enter+0x44/0x178) from [<c0010f08>] (syscall_trace_enter+0xf8/0x144) [ 158.856004] [<c0010f08>] (syscall_trace_enter+0xf8/0x144) from [<c000ee8c>] (__sys_trace+0xc/0x38) [ 158.864915] Code: e2842018 e7905102 e3550000 0a000037 (e595201c) [ 158.871136] ---[ end trace 70ef73d275f741de ]--- [ 158.875673] note: ls[2004] exited with preempt_count 1 Segmentation fault -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
