On Mon, 24 Feb 2025 18:56:31 -0800 Nathan Chancellor <nathan@xxxxxxxxxx> wrote: > I am also seeing a crash when booting arm64 with certain configurations > that I don't see at the parent change. Thanks, I also just bisected it down to this. But I didn't have early printk on so I didn't see what was crashing. So this is helpful. > > $ printf 'CONFIG_%s=y\n' FTRACE FUNCTION_TRACER >kernel/configs/repro.config > > $ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux- mrproper virtconfig repro.config Image.gz > > $ qemu-system-aarch64 \ > -display none \ > -nodefaults \ > -cpu max,pauth-impdef=true \ > -machine virt,gic-version=max,virtualization=true \ > -append 'console=ttyAMA0 earlycon' \ > -kernel arch/arm64/boot/Image.gz \ > -initrd rootfs.cpio \ > -m 512m \ > -serial mon:stdio > [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x000f0510] > [ 0.000000] Linux version 6.14.0-rc4-next-20250224-dirty (nathan@ax162) (aarch64-linux-gcc (GCC) 14.2.0, GNU ld (GNU Binutils) 2.42) #1 SMP PREEMPT Mon Feb 24 18:47:59 PST 2025 > ... > [ 0.000000] ------------[ cut here ]------------ > [ 0.000000] kernel BUG at arch/arm64/kernel/patching.c:39! > [ 0.000000] Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP > [ 0.000000] Modules linked in: > [ 0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.14.0-rc4-next-20250224-dirty #1 > [ 0.000000] Hardware name: linux,dummy-virt (DT) > [ 0.000000] pstate: 000000c9 (nzcv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) > [ 0.000000] pc : patch_map.constprop.0+0xfc/0x108 > [ 0.000000] lr : patch_map.constprop.0+0x3c/0x108 > [ 0.000000] sp : ffff96c0b6fa3ce0 > [ 0.000000] x29: ffff96c0b6fa3ce0 x28: ffff96c0b6faafd0 x27: 00000000000000ff > [ 0.000000] x26: fff9f3a0c2408080 x25: 0000000000000001 x24: fff9f3a0c2408000 > [ 0.000000] x23: 0000000000000000 x22: ffff96c0b72391d8 x21: 00000000000000c0 > [ 0.000000] x20: 000016c035400000 x19: 000016c035400000 x18: 00000000f0000000 > [ 0.000000] x17: 0000000000000068 x16: 0000000000000100 x15: ffff96c0b6fa39c4 > [ 0.000000] x14: 0000000000000008 x13: 0000000000000000 x12: ffffe9ce43090280 > [ 0.000000] x11: fff9f3a0dfef80c8 x10: ffffe9ce43090288 x9 : 0000000000000000 > [ 0.000000] x8 : fff9f3a0dfef80b8 x7 : fffa5ce02929a000 x6 : ffff96c0b6fa39d0 > [ 0.000000] x5 : 0000000000000030 x4 : 0000000000000000 x3 : ffff96c0b69b4000 > [ 0.000000] x2 : ffff96c0b69b4000 x1 : 0000000000000000 x0 : 0000000000000000 > [ 0.000000] Call trace: > [ 0.000000] patch_map.constprop.0+0xfc/0x108 (P) > [ 0.000000] aarch64_insn_write_literal_u64+0x38/0x80 > [ 0.000000] ftrace_init_nop+0x40/0xe0 > [ 0.000000] ftrace_process_locs+0x2a8/0x530 > [ 0.000000] ftrace_init+0x60/0x130 > [ 0.000000] start_kernel+0x4ac/0x708 > [ 0.000000] __primary_switched+0x88/0x98 > [ 0.000000] Code: d1681000 a8c27bfd d50323bf d65f03c0 (d4210000) > [ 0.000000] ---[ end trace 0000000000000000 ]--- > [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task! > [ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- > > I see the same crash with clang (after applying your suggested fix for > the issue that Arnd brought up). > > [ 0.000000] Unable to handle kernel paging request at virtual address 00001cb7f7800008 > [ 0.000000] Mem abort info: > [ 0.000000] ESR = 0x000000009600002b > [ 0.000000] EC = 0x25: DABT (current EL), IL = 32 bits > [ 0.000000] SET = 0, FnV = 0 > [ 0.000000] EA = 0, S1PTW = 0 > [ 0.000000] FSC = 0x2b: level -1 translation fault > [ 0.000000] Data abort info: > [ 0.000000] ISV = 0, ISS = 0x0000002b, ISS2 = 0x00000000 > [ 0.000000] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 > [ 0.000000] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 > [ 0.000000] [00001cb7f7800008] user address but active_mm is swapper > [ 0.000000] Internal error: Oops: 000000009600002b [#1] PREEMPT SMP > [ 0.000000] Modules linked in: > [ 0.000000] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.14.0-rc4-next-20250224-dirty #1 > [ 0.000000] Hardware name: linux,dummy-virt (DT) > [ 0.000000] pstate: 400000c9 (nZcv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--) > [ 0.000000] pc : ftrace_call_adjust+0x44/0xd0 > [ 0.000000] lr : ftrace_process_locs+0x1e0/0x560 > [ 0.000000] sp : ffff9cb878f93da0 > [ 0.000000] x29: ffff9cb878f93da0 x28: ffff9cb879234000 x27: ffff9cb879234000 > [ 0.000000] x26: 00001cb7f7800000 x25: ffff9cb878ed8578 x24: fffac24642008000 > [ 0.000000] x23: ffff9cb878f3cf90 x22: fffac24642008000 x21: 0000000000000000 > [ 0.000000] x20: 0000000000001000 x19: 00001cb7f7800000 x18: 0000000000000068 > [ 0.000000] x17: 0000000000000002 x16: 00000000fffffffe x15: ffff9cb878fa58c0 > [ 0.000000] x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 > [ 0.000000] x11: 0000000000000000 x10: 0000000000000000 x9 : 00007fff80000000 > [ 0.000000] x8 : 000000000000201f x7 : 0000000000000000 x6 : 6d6067666871ff73 > [ 0.000000] x5 : 0000000000000001 x4 : 0000000000000000 x3 : 0000000000000001 > [ 0.000000] x2 : 0000000000000004 x1 : 0000000000000040 x0 : 00001cb7f7800000 > [ 0.000000] Call trace: > [ 0.000000] ftrace_call_adjust+0x44/0xd0 (P) > [ 0.000000] ftrace_process_locs+0x1e0/0x560 > [ 0.000000] ftrace_init+0x7c/0xc8 > [ 0.000000] start_kernel+0x160/0x3b8 > [ 0.000000] __primary_switched+0x88/0x98 > [ 0.000000] Code: aa1f03e0 14000014 aa0003f3 528403e8 (b8408e74) > > If there is any other information I can provide or patches I can test, I > am more than happy to do so. Thanks, I'm about to go to bed soon and I'll take a look more into it tomorrow. -- Steve
