8<--- cut here --- Unable to handle kernel paging request at virtual address fee0f003 when write [fee0f003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 23554 Comm: syz.5.3742 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 : [<8146ca18>] lr : [<8146ca04>] psr: 60000013 sp : dfcf9cb8 ip : dfcf9cb8 fp : dfcf9cd4 r10: 0000f000 r9 : 00000004 r8 : dfcf9da4 r7 : 00000000 r6 : 0000009b r5 : 846703c0 r4 : 0000f003 r3 : 0000009b r2 : fee0f003 r1 : 00000001 r0 : 846703c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8606fd00 DAC: 00000000 Register r0 information: slab kmalloc-192 start 846703c0 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 846703c0 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 0xdfcf8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2745 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfcf8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2745 Register r12 information: 2-page vmalloc region starting at 0xdfcf8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2745 Process syz.5.3742 (pid: 23554, stack limit = 0xdfcf8000) Stack: (0xdfcf9cb8 to 0xdfcfa000) 9ca0: 8146c9b8 0000f000 9cc0: 846703c0 00000000 dfcf9cf4 dfcf9cd8 8146c6f4 8146c9c4 0000f000 805373c8 9ce0: 85623000 85623000 dfcf9d14 dfcf9cf8 8146caac 8146c6a8 846703c0 00000000 9d00: 85623000 00000000 dfcf9d54 dfcf9d18 8146cc5c 8146ca30 ffffffff 00000004 9d20: 82a20900 00000000 00000000 82bd3e64 846703c0 00000000 dfcf9d90 846703c0 9d40: 00000000 82d2a7bc dfcf9d8c dfcf9d58 8145b600 8146cbf4 40946400 00000000 9d60: dfcf9d7c 20000080 846703c0 b5403587 40946400 00000001 00000003 8755b100 9d80: dfcf9e4c dfcf9d90 81456e0c 8145b504 35353238 00000000 00000000 00000000 9da0: 00000000 0000f000 00000d7c 0000002f 00002000 00000000 00000003 00000002 9dc0: 0000000f 00000ffe 00000001 00000007 0000091d 00001006 00000008 0000ffff 9de0: 00000006 00000003 000000f0 00000401 00000005 00000040 00010000 00000800 9e00: 0000e2df 00000009 00000001 00000001 00000000 00000007 00000005 00000009 9e20: 00000000 f8f4e7ee 00000000 8ce7b880 846703c0 20000080 40946400 00000001 9e40: dfcf9f14 dfcf9e50 81458130 81456d44 00000000 f8f4e7ee 00000000 00000000 9e60: 82536804 dfcf9ea4 0000005f 83158990 00000064 846703f0 dfcf9ee4 dfcf9e88 9e80: 807ef658 807e596c 00000064 00000001 00000000 dfcf9ea4 853bc610 834206e8 9ea0: 00006400 0000000b dfcf9e98 00000000 00000000 f8f4e7ee 00000000 8ce7b880 9ec0: 40946400 20000080 20000080 8ce7b880 00000003 8755b100 dfcf9ef4 dfcf9ee8 9ee0: 807ef78c f8f4e7ee dfcf9f14 00000000 8ce7b881 40946400 20000080 8ce7b880 9f00: 00000003 8755b100 dfcf9fa4 dfcf9f18 805a617c 81457de8 ecac8b10 8755b100 9f20: dfcf9f3c dfcf9f30 81b1a500 81b1a3cc dfcf9f54 dfcf9f40 8025a7e8 8028e3d8 9f40: dfcf9fb0 40000000 dfcf9f84 dfcf9f58 80220bdc 8025a7a4 00000000 82a1c64c 9f60: dfcf9fb0 0013e9b0 ecac8b10 80220b30 00000000 f8f4e7ee dfcf9fac 00000000 9f80: 00000000 00346310 00000036 8020029c 8755b100 00000036 00000000 dfcf9fa8 9fa0: 80200060 805a5f44 00000000 00000000 00000003 40946400 20000080 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fff0dc 9fe0: 76ffee88 76ffee78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<8146c9b8>] (subdev_8255_io) from [<8146c6f4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:846703c0 r5:0000f000 r4:8146c9b8 [<8146c69c>] (subdev_8255_do_config) from [<8146caac>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8146c69c>] (subdev_8255_do_config) from [<8146caac>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85623000 [<8146ca24>] (subdev_8255_io_init) from [<8146cc5c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8146ca24>] (subdev_8255_io_init) from [<8146cc5c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:85623000 r5:00000000 r4:846703c0 [<8146cbe8>] (dev_8255_attach) from [<8145b600>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2a7bc r9:00000000 r8:846703c0 r7:dfcf9d90 r6:00000000 r5:846703c0 r4:82bd3e64 [<8145b4f8>] (comedi_device_attach) from [<81456e0c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:8755b100 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:846703c0 r4:20000080 [<81456d38>] (do_devconfig_ioctl) from [<81458130>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000080 r5:846703c0 r4:8ce7b880 [<81457ddc>] (comedi_unlocked_ioctl) from [<805a617c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81457ddc>] (comedi_unlocked_ioctl) from [<805a617c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81457ddc>] (comedi_unlocked_ioctl) from [<805a617c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81457ddc>] (comedi_unlocked_ioctl) from [<805a617c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8755b100 r9:00000003 r8:8ce7b880 r7:20000080 r6:40946400 r5:8ce7b881 r4:00000000 [<805a5f38>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcf9fa8 to 0xdfcf9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000080 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fff0dc 9fe0: 76ffee88 76ffee78 00018ebc 00130810 r10:00000036 r9:8755b100 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