Jisheng Zhang 76f5dfacfb riscv: stacktrace: pin the task's stack in get_wchan ... Pin the task's stack before calling walk_stackframe() in get_wchan(). This can fix the panic as reported by Andreas when CONFIG_VMAP_STACK=y: [ 65.609696] Unable to handle kernel paging request at virtual address ffffffd0003bbde8 [ 65.610460] Oops [#1] [ 65.610626] Modules linked in: virtio_blk virtio_mmio rtc_goldfish btrfs blake2b_generic libcrc32c xor raid6_pq sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua efivarfs [ 65.611670] CPU: 2 PID: 1 Comm: systemd Not tainted 5.14.0-rc1-1.g34fe32a-default #1 openSUSE Tumbleweed (unreleased) c62f7109153e5a0897ee58ba52393ad99b070fd2 [ 65.612334] Hardware name: riscv-virtio,qemu (DT) [ 65.613008] epc : get_wchan+0x5c/0x88 [ 65.613334] ra : get_wchan+0x42/0x88 [ 65.613625] epc : ffffffff800048a4 ra : ffffffff8000488a sp : ffffffd00021bb90 [ 65.614008] gp : ffffffff817709f8 tp : ffffffe07fe91b80 t0 : 00000000000001f8 [ 65.614411] t1 : 0000000000020000 t2 : 0000000000000000 s0 : ffffffd00021bbd0 [ 65.614818] s1 : ffffffd0003bbdf0 a0 : 0000000000000001 a1 : 0000000000000002 [ 65.615237] a2 : ffffffff81618008 a3 : 0000000000000000 a4 : 0000000000000000 [ 65.615637] a5 : ffffffd0003bc000 a6 : 0000000000000002 a7 : ffffffe27d370000 [ 65.616022] s2 : ffffffd0003bbd90 s3 : ffffffff8071a81e s4 : 0000000000003fff [ 65.616407] s5 : ffffffffffffc000 s6 : 0000000000000000 s7 : ffffffff81618008 [ 65.616845] s8 : 0000000000000001 s9 : 0000000180000040 s10: 0000000000000000 [ 65.617248] s11: 000000000000016b t3 : 000000ff00000000 t4 : 0c6aec92de5e3fd7 [ 65.617672] t5 : fff78f60608fcfff t6 : 0000000000000078 [ 65.618088] status: 0000000000000120 badaddr: ffffffd0003bbde8 cause: 000000000000000d [ 65.618621] [<ffffffff800048a4>] get_wchan+0x5c/0x88 [ 65.619008] [<ffffffff8022da88>] do_task_stat+0x7a2/0xa46 [ 65.619325] [<ffffffff8022e87e>] proc_tgid_stat+0xe/0x16 [ 65.619637] [<ffffffff80227dd6>] proc_single_show+0x46/0x96 [ 65.619979] [<ffffffff801ccb1e>] seq_read_iter+0x190/0x31e [ 65.620341] [<ffffffff801ccd70>] seq_read+0xc4/0x104 [ 65.620633] [<ffffffff801a6bfe>] vfs_read+0x6a/0x112 [ 65.620922] [<ffffffff801a701c>] ksys_read+0x54/0xbe [ 65.621206] [<ffffffff801a7094>] sys_read+0xe/0x16 [ 65.621474] [<ffffffff8000303e>] ret_from_syscall+0x0/0x2 [ 65.622169] ---[ end trace f24856ed2b8789c5 ]--- [ 65.622832] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>		2021-07-23 17:29:03 -07:00
..
boot	riscv: dts: fu740: fix cache-controller interrupts	2021-06-19 00:11:53 -07:00
configs	RISC-V: Enable Microchip PolarFire ICICLE SoC	2021-04-26 08:31:32 -07:00
errata	riscv: skip errata_cip_453.o if CONFIG_ERRATA_SIFIVE_CIP_453 is disabled	2021-06-01 21:16:41 -07:00
include	RISC-V: load initrd wherever it fits into memory	2021-07-21 22:58:17 -07:00
kernel	riscv: stacktrace: pin the task's stack in get_wchan	2021-07-23 17:29:03 -07:00
lib	riscv: __asm_copy_to-from_user: Optimize unaligned memory access and pipeline stall	2021-07-06 15:09:48 -07:00
mm	riscv: Make sure the kernel mapping does not overlap with IS_ERR_VALUE	2021-07-22 21:34:36 -07:00
net	riscv: bpf: Avoid breaking W^X	2021-04-26 08:25:14 -07:00
Kbuild	riscv: Allow device trees to be built into the kernel	2020-05-18 11:38:05 -07:00
Kconfig	RISC-V Patches for the 5.14 Merge Window, Part 1	2021-07-09 10:36:29 -07:00
Kconfig.debug	RISC-V: Remove EARLY_PRINTK support	2018-12-17 10:23:46 -08:00
Kconfig.erratas	riscv: enable SiFive errata CIP-453 and CIP-1200 Kconfig only if CONFIG_64BIT=y	2021-05-06 09:40:13 -07:00
Kconfig.socs	riscv: sifive: fix Kconfig errata warning	2021-06-12 17:20:50 -07:00
Makefile	Kbuild updates for v5.14	2021-07-10 11:01:38 -07:00