8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 19368 Comm: syz.5.2934 Not tainted 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 : [<813db598>] lr : [<813db584>] psr: 60000013 sp : e0005cb8 ip : e0005cb8 fp : e0005cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 84152000 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 84152000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85380640 DAC: 00000000 Register r0 information: slab kmalloc-192 start 84152000 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 84152000 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 0xe0004000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xe0004000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.5.2934 (pid: 19368, stack limit = 0xe0004000) Stack: (0xe0005cb8 to 0xe0006000) 5ca0: 813db538 84152000 5cc0: 00004f27 00004f27 e0005cf4 e0005cd8 813db270 813db544 00004f27 8050a430 5ce0: 84a43800 84a43800 e0005d14 e0005cf8 813db630 813db224 84a43800 84152000 5d00: e0005da4 00004f27 e0005d54 e0005d18 813db824 813db5b0 82af1fe0 853ce400 5d20: 828215f0 00000000 00000000 829d238c 84152000 84152044 e0005d90 84152000 5d40: 00000000 82b25910 e0005d8c e0005d58 813ca720 813db774 200000c0 00000000 5d60: e0005d7c 200000c0 84152000 b5403587 200000c0 83836000 40946400 00000003 5d80: e0005e4c e0005d90 813c626c 813ca624 35353238 00000000 00000000 00000000 5da0: 00000000 00004f27 00000007 00000001 00000016 00000005 00000005 00000008 5dc0: 00000003 0000000a 000000fd 00000002 00000000 00000001 00000001 00000006 5de0: 00080009 fffffffe 0000007f 00000003 40000003 00000089 0000ca9f 00000003 5e00: 00008001 0000000b 00000e66 00000000 0995d000 00004085 00000000 fffffff8 5e20: 00000000 ffe3ee7e 00000000 85009480 84152000 200000c0 200000c0 83836000 5e40: e0005f14 e0005e50 813c7238 813c6178 00000000 00000000 00000000 ffe3ee7e 5e60: 00000000 00000000 824625b4 0000005f 83c1a640 84152030 841335ac 83836000 5e80: e0005ee4 e0005e90 807a7684 8079da7c 00000064 00000001 00000000 e0005eac 5ea0: 84d81490 8342b908 00006400 0000000b e0005ea0 00000000 00000000 ffe3ee7e 5ec0: 85009480 40946400 200000c0 200000c0 85009480 00000003 e0005ef4 e0005ee8 5ee0: 807a77a4 ffe3ee7e e0005f14 40946400 00000000 85009481 200000c0 85009480 5f00: 00000003 83836000 e0005fa4 e0005f18 805788b8 813c6c68 ecac8b10 83836000 5f20: e0005f3c e0005f30 81a60ab8 81a60988 e0005f54 e0005f40 8025c484 8028d914 5f40: e0005fb0 40000000 e0005f84 e0005f58 802229ec 8025c440 00000000 8281cfb4 5f60: e0005fb0 0014ced0 ecac8b10 80222940 00000000 ffe3ee7e e0005fac 00000000 5f80: 00000000 00316308 00000036 8020029c 83836000 00000036 00000000 e0005fa8 5fa0: 80200060 80578794 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f420bc 5fe0: 76f41ec0 76f41eb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813db538>] (subdev_8255_io) from [<813db270>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:84152000 r4:813db538 [<813db218>] (subdev_8255_do_config) from [<813db630>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db218>] (subdev_8255_do_config) from [<813db630>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84a43800 [<813db5a4>] (subdev_8255_io_init) from [<813db824>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813db5a4>] (subdev_8255_io_init) from [<813db824>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:e0005da4 r5:84152000 r4:84a43800 [<813db768>] (dev_8255_attach) from [<813ca720>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:84152000 r7:e0005d90 r6:84152044 r5:84152000 r4:829d238c [<813ca618>] (comedi_device_attach) from [<813c626c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83836000 r7:200000c0 r6:b5403587 r5:84152000 r4:200000c0 [<813c616c>] (do_devconfig_ioctl) from [<813c7238>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83836000 r7:200000c0 r6:200000c0 r5:84152000 r4:85009480 [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83836000 r9:00000003 r8:85009480 r7:200000c0 r6:85009481 r5:00000000 r4:40946400 [<80578788>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0005fa8 to 0xe0005ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f420bc 5fe0: 76f41ec0 76f41eb0 0001928c 00132970 r10:00000036 r9:83836000 r8:8020029c r7:00000036 r6:00316308 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