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: 4736 Comm: syz.1.201 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 : [<813dbc00>] lr : [<813dbbec>] psr: 60000013 sp : dfbe1cb8 ip : dfbe1cb8 fp : dfbe1cd4 r10: 00000000 r9 : 00000000 r8 : 00000084 r7 : 00004f27 r6 : 0000009b r5 : 838aca80 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 838aca80 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84931d40 DAC: 00000000 Register r0 information: slab kmalloc-192 start 838aca80 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 838aca80 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 0xdfbe0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfbe0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.201 (pid: 4736, stack limit = 0xdfbe0000) Stack: (0xdfbe1cb8 to 0xdfbe2000) 1ca0: 813dbba0 838aca80 1cc0: 00004f27 00004f27 dfbe1cf4 dfbe1cd8 813db8d8 813dbbac 00004f27 8050a7fc 1ce0: 85e98000 85e98000 dfbe1d14 dfbe1cf8 813dbc98 813db88c 85e98000 838aca80 1d00: dfbe1da4 00004f27 dfbe1d54 dfbe1d18 813dbe8c 813dbc18 82af1fe0 85a5b980 1d20: 828215f0 00000000 00000000 829d23cc 838aca80 838acac4 dfbe1d90 838aca80 1d40: 00000000 82b25910 dfbe1d8c dfbe1d58 813cad84 813dbddc 200000c0 00000000 1d60: dfbe1d7c 200000c0 838aca80 b5403587 200000c0 84e5ec00 40946400 00000003 1d80: dfbe1e4c dfbe1d90 813c68d0 813cac88 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000629 00000002 00000401 00000002 00000cc7 00000fff 1dc0: 5c952399 0000000d 000003ff 00000002 00000001 00000001 00000001 00000009 1de0: 0000e1cb 00000000 0001a449 00000003 40000003 00000089 fffffffd 80000000 1e00: 20001e56 0000000b 00000e69 0000003c 00000008 00000106 08000000 00000002 1e20: 00000000 253ee393 00000000 854039c0 838aca80 200000c0 200000c0 84e5ec00 1e40: dfbe1f14 dfbe1e50 813c789c 813c67dc 00000000 00000000 00000000 253ee393 1e60: 00000000 00000000 824625b4 0000005f 83dfa058 838acab0 84172714 84e5ec00 1e80: dfbe1ee4 dfbe1e90 807a7d9c 8079e194 00000064 00000001 00000000 dfbe1eac 1ea0: 85a6bb50 834d7cc0 00006400 0000000b dfbe1ea0 00000000 00000000 253ee393 1ec0: 854039c0 40946400 200000c0 200000c0 854039c0 00000003 dfbe1ef4 dfbe1ee8 1ee0: 807a7ebc 253ee393 dfbe1f14 40946400 00000000 854039c1 200000c0 854039c0 1f00: 00000003 84e5ec00 dfbe1fa4 dfbe1f18 80578f00 813c72cc ecac8b10 84e5ec00 1f20: dfbe1f3c dfbe1f30 81a613e0 81a612b0 dfbe1f54 dfbe1f40 8025c484 8028d914 1f40: dfbe1fb0 40000000 dfbe1f84 dfbe1f58 802229ec 8025c440 00000000 8281cfb4 1f60: dfbe1fb0 0014ced0 ecac8b10 80222940 00000000 253ee393 dfbe1fac 00000000 1f80: 00000000 00316308 00000036 8020029c 84e5ec00 00000036 00000000 dfbe1fa8 1fa0: 80200060 80578ddc 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f340bc 1fe0: 76f33ec0 76f33eb0 00019294 00132970 60000010 00000003 00000000 00000000 Call trace: [<813dbba0>] (subdev_8255_io) from [<813db8d8>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:838aca80 r4:813dbba0 [<813db880>] (subdev_8255_do_config) from [<813dbc98>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<813db880>] (subdev_8255_do_config) from [<813dbc98>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:85e98000 [<813dbc0c>] (subdev_8255_io_init) from [<813dbe8c>] (dev_8255_attach drivers/comedi/drivers/8255.c:83 [inline]) [<813dbc0c>] (subdev_8255_io_init) from [<813dbe8c>] (dev_8255_attach+0xbc/0x114 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:dfbe1da4 r5:838aca80 r4:85e98000 [<813dbdd0>] (dev_8255_attach) from [<813cad84>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r10:82b25910 r9:00000000 r8:838aca80 r7:dfbe1d90 r6:838acac4 r5:838aca80 r4:829d23cc [<813cac7c>] (comedi_device_attach) from [<813c68d0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84e5ec00 r7:200000c0 r6:b5403587 r5:838aca80 r4:200000c0 [<813c67d0>] (do_devconfig_ioctl) from [<813c789c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:84e5ec00 r7:200000c0 r6:200000c0 r5:838aca80 r4:854039c0 [<813c72c0>] (comedi_unlocked_ioctl) from [<80578f00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c72c0>] (comedi_unlocked_ioctl) from [<80578f00>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c72c0>] (comedi_unlocked_ioctl) from [<80578f00>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c72c0>] (comedi_unlocked_ioctl) from [<80578f00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84e5ec00 r9:00000003 r8:854039c0 r7:200000c0 r6:854039c1 r5:00000000 r4:40946400 [<80578dd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbe1fa8 to 0xdfbe1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f340bc 1fe0: 76f33ec0 76f33eb0 00019294 00132970 r10:00000036 r9:84e5ec00 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