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: 27466 Comm: syz.2.5724 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<81414640>] lr : [<8141462c>] psr: 60000013 sp : ea4adcb8 ip : ea4adcb8 fp : ea4adcd4 r10: 00000000 r9 : 00000084 r8 : ea4adda4 r7 : 00004f27 r6 : 0000009b r5 : 8385ee40 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8385ee40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85f3ad40 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8385ee40 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 8385ee40 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xea4ac000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2654 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xea4ac000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xea4ac000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2654 Process syz.2.5724 (pid: 27466, stack limit = 0xea4ac000) Stack: (0xea4adcb8 to 0xea4ae000) dca0: 814145e0 00004f27 dcc0: 8385ee40 00004f27 ea4adcf4 ea4adcd8 8141431c 814145ec 00004f27 80517404 dce0: 831c6000 831c6000 ea4add14 ea4adcf8 814146d4 814142d0 8385ee40 00000000 dd00: 831c6000 00004f27 ea4add54 ea4add18 81414884 81414658 82b11dcc 83fdce00 dd20: 82821780 00000000 00000000 829d5c04 8385ee40 00000000 ea4add90 8385ee40 dd40: 00000000 82b2bc14 ea4add8c ea4add58 81403270 8141481c 40946400 00000000 dd60: ea4add7c 20000200 8385ee40 b5403587 40946400 859a4800 00000003 8385ee70 dd80: ea4ade4c ea4add90 813feba8 81403170 35353238 00000000 00000000 00000000 dda0: 00000000 00004f27 0000000a ffffffff 00000401 00000001 00000cd7 00000fff ddc0: 5c952399 ffffffff 000003ff fffff000 00001600 fffffffe 00000001 00000009 dde0: 0000e1cb 00007bbd 00000004 00000003 00000396 80000089 fffffffe 00000000 de00: fffffff1 ffffeadb 00000003 0000003a 00000001 00000004 08000000 dffffffa de20: 00000000 c68f9032 00000000 85f55c00 8385ee40 20000200 40946400 859a4800 de40: ea4adf14 ea4ade50 813ff728 813feae0 00000000 c68f9032 00000000 00000000 de60: 824b157c ea4adea4 0000005f 8422f018 00000064 846ff5f4 ea4adee4 ea4ade88 de80: 807b5410 807ab7e8 00000064 00000001 00000000 ea4adea4 833b2e50 834e7908 dea0: 00006400 0000000b ea4ade98 00000000 00000000 c68f9032 00000000 85f55c00 dec0: 40946400 20000200 20000200 85f55c00 00000003 859a4800 ea4adef4 ea4adee8 dee0: 807b5540 c68f9032 ea4adf14 00000000 85f55c01 40946400 20000200 85f55c00 df00: 00000003 859a4800 ea4adfa4 ea4adf18 8058219c 813ff630 ecac8b10 859a4800 df20: ea4adf3c ea4adf30 81ab175c 81ab1628 ea4adf54 ea4adf40 8025a030 8028d73c df40: ea4adfb0 40000000 ea4adf84 ea4adf58 80220a4c 80259fec 00000000 8281d27c df60: ea4adfb0 0013ddc0 ecac8b10 802209a0 00000000 c68f9032 ea4adfac 00000000 df80: 00000000 00346310 00000036 8020029c 859a4800 00000036 00000000 ea4adfa8 dfa0: 80200060 80581f64 00000000 00000000 00000003 40946400 20000200 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f1f0dc dfe0: 76f1ee88 76f1ee78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<814145e0>] (subdev_8255_io) from [<8141431c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:8385ee40 r5:00004f27 r4:814145e0 [<814142c4>] (subdev_8255_do_config) from [<814146d4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814142c4>] (subdev_8255_do_config) from [<814146d4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:831c6000 [<8141464c>] (subdev_8255_io_init) from [<81414884>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8141464c>] (subdev_8255_io_init) from [<81414884>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:831c6000 r5:00000000 r4:8385ee40 [<81414810>] (dev_8255_attach) from [<81403270>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2bc14 r9:00000000 r8:8385ee40 r7:ea4add90 r6:00000000 r5:8385ee40 r4:829d5c04 [<81403164>] (comedi_device_attach) from [<813feba8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:8385ee70 r9:00000003 r8:859a4800 r7:40946400 r6:b5403587 r5:8385ee40 r4:20000200 [<813fead4>] (do_devconfig_ioctl) from [<813ff728>] (comedi_unlocked_ioctl+0x104/0x1c80 drivers/comedi/comedi_fops.c:2240) r8:859a4800 r7:40946400 r6:20000200 r5:8385ee40 r4:85f55c00 [<813ff624>] (comedi_unlocked_ioctl) from [<8058219c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813ff624>] (comedi_unlocked_ioctl) from [<8058219c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813ff624>] (comedi_unlocked_ioctl) from [<8058219c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813ff624>] (comedi_unlocked_ioctl) from [<8058219c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:859a4800 r9:00000003 r8:85f55c00 r7:20000200 r6:40946400 r5:85f55c01 r4:00000000 [<80581f58>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea4adfa8 to 0xea4adff0) dfa0: 00000000 00000000 00000003 40946400 20000200 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f1f0dc dfe0: 76f1ee88 76f1ee78 00018734 0012fc20 r10:00000036 r9:859a4800 r8:8020029c r7:00000036 r6:00346310 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