8<--- cut here --- Unable to handle kernel paging request at virtual address fee1ffc3 when write [fee1ffc3] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 17515 Comm: syz.5.2936 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:99 [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 : [<8149fd08>] lr : [<8149fcf4>] psr: 60000013 sp : dfb7dcb8 ip : dfb7dcb8 fp : dfb7dcd4 r10: 0001ffc0 r9 : 00000004 r8 : dfb7dda4 r7 : 00000000 r6 : 0000009b r5 : 84646840 r4 : 0001ffc3 r3 : 0000009b r2 : fee1ffc3 r1 : 00000001 r0 : 84646840 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85fb8e00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 84646840 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:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 84646840 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xdfb7c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfb7c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfb7c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.5.2936 (pid: 17515, stack limit = 0xdfb7c000) Stack: (0xdfb7dcb8 to 0xdfb7e000) dca0: 8149fca8 0001ffc0 dcc0: 84646840 00000000 dfb7dcf4 dfb7dcd8 8149f9e4 8149fcb4 0001ffc0 80546014 dce0: 8644b000 8644b000 dfb7dd14 dfb7dcf8 8149fd9c 8149f998 84646840 00000000 dd00: 8644b000 00000000 dfb7dd54 dfb7dd18 8149ff4c 8149fd20 ffffffff 00000004 dd20: 82a22dc0 00000000 00000000 82bd961c 84646840 00000000 dfb7dd90 84646840 dd40: 00000000 82d30dfc dfb7dd8c dfb7dd58 8148e8f0 8149fee4 40946400 00000000 dd60: dfb7dd7c 20000180 84646840 b5403587 40946400 00000001 00000003 897c6e40 dd80: dfb7de4c dfb7dd90 8148a0f4 8148e7f4 35353238 00000000 00000000 00000000 dda0: 00000000 0001ffc0 80000000 00000000 00000400 00000002 00800025 00000007 ddc0: 00000006 0000000b 000400fd 00000003 00000000 ffff8001 fffffffd 0010000b dde0: 000000fd 00000044 0000007a 00000003 00000005 00000089 00000013 0000007f de00: 0f764e1d 00000009 00000e66 00000001 00000003 00000003 00000000 00000001 de20: 00000000 80f92053 00000000 86607580 84646840 20000180 40946400 00000001 de40: dfb7df14 dfb7de50 8148b41c 8148a034 dfb7de4c 80f92053 00000000 00000000 de60: 8254980c dfb7dea4 0000005f 842b1dd8 00000064 84646870 dfb7dee4 dfb7de88 de80: 80806188 807fc404 00000064 00000001 00000000 dfb7dea4 830e9810 8341e908 dea0: 00006400 0000000b dfb7de98 00000000 dfb7dd38 80f92053 dfb7df54 86607580 dec0: 40946400 20000180 20000180 86607580 00000003 897c6e40 dfb7def4 dfb7dee8 dee0: 808062bc 80f92053 dfb7df14 00000000 86607581 40946400 20000180 86607580 df00: 00000003 897c6e40 dfb7dfa4 dfb7df18 805bab28 8148b0d4 ecac8b10 897c6e40 df20: dfb7df3c dfb7df30 81b576c0 81b5758c dfb7df54 dfb7df40 8025a7a8 8028e490 df40: dfb7dfb0 40000000 dfb7df84 dfb7df58 80220bdc 8025a764 00000000 82a1eb0c df60: dfb7dfb0 0013e9c0 ecac8b10 80220b30 00000000 80f92053 dfb7dfac 00000000 df80: 00000000 00356310 00000036 8020029c 897c6e40 00000036 00000000 dfb7dfa8 dfa0: 80200060 805ba8f0 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f660dc dfe0: 76f65e88 76f65e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<8149fca8>] (subdev_8255_io) from [<8149f9e4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:84646840 r5:0001ffc0 r4:8149fca8 [<8149f98c>] (subdev_8255_do_config) from [<8149fd9c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8149f98c>] (subdev_8255_do_config) from [<8149fd9c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8644b000 [<8149fd14>] (subdev_8255_io_init) from [<8149ff4c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8149fd14>] (subdev_8255_io_init) from [<8149ff4c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:8644b000 r5:00000000 r4:84646840 [<8149fed8>] (dev_8255_attach) from [<8148e8f0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:84646840 r7:dfb7dd90 r6:00000000 r5:84646840 r4:82bd961c [<8148e7e8>] (comedi_device_attach) from [<8148a0f4>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:897c6e40 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:84646840 r4:20000180 [<8148a028>] (do_devconfig_ioctl) from [<8148b41c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000180 r5:84646840 r4:86607580 [<8148b0c8>] (comedi_unlocked_ioctl) from [<805bab28>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148b0c8>] (comedi_unlocked_ioctl) from [<805bab28>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148b0c8>] (comedi_unlocked_ioctl) from [<805bab28>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148b0c8>] (comedi_unlocked_ioctl) from [<805bab28>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:897c6e40 r9:00000003 r8:86607580 r7:20000180 r6:40946400 r5:86607581 r4:00000000 [<805ba8e4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb7dfa8 to 0xdfb7dff0) dfa0: 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f660dc dfe0: 76f65e88 76f65e78 00018ebc 00130820 r10:00000036 r9:897c6e40 r8:8020029c r7:00000036 r6:00356310 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