8<--- cut here --- Unable to handle kernel paging request at virtual address fee00007 when write [fee00007] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 32403 Comm: syz.3.6610 Not tainted 6.16.0-rc5-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] PC is at subdev_8255_io+0x60/0x6c drivers/comedi/drivers/comedi_8255.c:43 LR is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] LR is at subdev_8255_io+0x4c/0x6c drivers/comedi/drivers/comedi_8255.c:43 pc : [<813a4c50>] lr : [<813a4c3c>] psr: 60000013 sp : df97dcc0 ip : df97dcc0 fp : df97dcdc r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00000004 r6 : 0000009b r5 : 830e7840 r4 : 00000007 r3 : 0000009b r2 : fee00007 r1 : 00000001 r0 : 830e7840 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85cc0240 DAC: fffffffd Register r0 information: slab kmalloc-192 start 830e7840 pointer offset 0 size 192 Register r1 information: non-paged memory Register r2 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 830e7840 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: non-paged memory Register r9 information: NULL pointer Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xdf97c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdf97c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.3.6610 (pid: 32403, stack limit = 0xdf97c000) Stack: (0xdf97dcc0 to 0xdf97e000) dcc0: 813a4bf0 830e7840 00000004 00000004 df97dcfc df97dce0 813a4928 813a4bfc dce0: 00000004 80507884 86a20000 86a20000 df97dd1c df97dd00 813a4ce8 813a48dc dd00: 86a20000 830e7840 df97ddac 00000004 df97dd5c df97dd20 813a4edc 813a4c68 dd20: 20000013 84e5c600 82822670 00000000 00000000 829c5270 830e7840 00000000 dd40: df97dd98 830e7840 00000000 82b15078 df97dd94 df97dd60 81393e00 813a4e2c dd60: 20000180 00000000 df97dd84 20000180 830e7840 b5403587 20000180 85739800 dd80: 40946400 00000000 df97de4c df97dd98 8138fa90 81393d08 35353238 00000000 dda0: 00000000 00000000 00000000 00000004 0000000e 00000008 fffffffb 00001000 ddc0: 00000101 00006623 00000006 0000000b 00000008 fffffffa 00000002 fffffffe dde0: 00000008 00000006 00000007 00000003 00000007 00000003 0000a261 00000010 de00: 00000005 00000009 00000009 00000005 00002004 ffffffff 0000c005 00000059 de20: 00000000 00000004 00000000 de91a59e 00000000 84d22540 830e7840 20000180 de40: df97df14 df97de50 81390a44 8138f9c4 00000000 00000000 00000000 de91a59e de60: 00000000 00000000 8246a3fc 0000005f 840da258 830e7870 841ac0e4 85739800 de80: df97dee4 df97de90 80795a0c 8078bcfc 00000064 00000001 00000000 df97deac dea0: 84929190 834282a8 00006400 0000000b df97dea0 00000000 00000000 de91a59e dec0: 84d22540 40946400 20000180 20000180 00000003 84d22540 df97def4 df97dee8 dee0: 80795b2c de91a59e df97df14 40946400 00000000 84d22541 20000180 00000003 df00: 84d22540 85739800 df97dfa4 df97df18 8056e2dc 81390474 ecac8b10 85739800 df20: df97df3c df97df30 81a2cd08 81a2cbd8 df97df54 df97df40 80261ffc 80293598 df40: df97dfb0 40000000 df97df84 df97df58 802229ec 80261fb8 00000000 8281d09c df60: df97dfb0 0014c4a0 ecac8b10 80222940 00000000 de91a59e df97dfac 00000000 df80: 00000000 002f6300 00000036 8020029c 85739800 00000036 00000000 df97dfa8 dfa0: 80200060 8056e1b8 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b6d0bc dfe0: 76b6cec0 76b6ceb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<813a4bf0>] (subdev_8255_io) from [<813a4928>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000004 r6:00000004 r5:830e7840 r4:813a4bf0 [<813a48d0>] (subdev_8255_do_config) from [<813a4ce8>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813a48d0>] (subdev_8255_do_config) from [<813a4ce8>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:86a20000 [<813a4c5c>] (subdev_8255_io_init) from [<813a4edc>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813a4c5c>] (subdev_8255_io_init) from [<813a4edc>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00000004 r6:df97ddac r5:830e7840 r4:86a20000 [<813a4e20>] (dev_8255_attach) from [<81393e00>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r10:82b15078 r9:00000000 r8:830e7840 r7:df97dd98 r6:00000000 r5:830e7840 r4:829c5270 [<81393cfc>] (comedi_device_attach) from [<8138fa90>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000000 r9:40946400 r8:85739800 r7:20000180 r6:b5403587 r5:830e7840 r4:20000180 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000180 r5:830e7840 r4:84d22540 [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:85739800 r9:84d22540 r8:00000003 r7:20000180 r6:84d22541 r5:00000000 r4:40946400 [<8056e1ac>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf97dfa8 to 0xdf97dff0) dfa0: 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b6d0bc dfe0: 76b6cec0 76b6ceb0 000193a4 00131f40 r10:00000036 r9:85739800 r8:8020029c r7:00000036 r6:002f6300 r5:00000000 r4:00000000 Code: e6ef3076 e0842002 e7f32052 e2422612 (e5c23000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef3076 uxtb r3, r6 4: e0842002 add r2, r4, r2 8: e7f32052 ubfx r2, r2, #0, #20 c: e2422612 sub r2, r2, #18874368 @ 0x1200000 * 10: e5c23000 strb r3, [r2] <-- trapping instruction