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: 5898 Comm: syz.2.509 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 : [<81442de0>] lr : [<81442dcc>] psr: 60000013 sp : dfb01cb8 ip : dfb01cb8 fp : dfb01cd4 r10: 00000000 r9 : 00000084 r8 : dfb01da4 r7 : 00004f27 r6 : 0000009b r5 : 847696c0 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 847696c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 863dd200 DAC: 00000000 Register r0 information: slab kmalloc-192 start 847696c0 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 847696c0 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 0xdfb00000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xdfb00000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xdfb00000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.2.509 (pid: 5898, stack limit = 0xdfb00000) Stack: (0xdfb01cb8 to 0xdfb02000) 1ca0: 81442d80 00004f27 1cc0: 847696c0 00004f27 dfb01cf4 dfb01cd8 81442abc 81442d8c 00004f27 80524064 1ce0: 833be000 833be000 dfb01d14 dfb01cf8 81442e74 81442a70 847696c0 00000000 1d00: 833be000 00004f27 dfb01d54 dfb01d18 81443024 81442df8 82b05ad4 838b7080 1d20: 82821840 00000000 00000000 829d7360 847696c0 00000000 dfb01d90 847696c0 1d40: 00000000 82b2f0bc dfb01d8c dfb01d58 81431968 81442fbc 40946400 00000000 1d60: dfb01d7c 20000200 847696c0 b5403587 40946400 00000003 00000003 83f98c40 1d80: dfb01e4c dfb01d90 8142d174 81431868 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000005 00000000 00008401 00000001 00000cc8 00000fff 1dc0: 00000008 00000005 000003ff 00000802 00000300 00000005 00000001 00000009 1de0: 0000e1cb 00000006 00000004 00000078 00000395 80000089 fffffffd 0000000c 1e00: 000000ae ffffeadb ffff7af0 0000003c 00000008 00000004 08000000 dffffffa 1e20: 00000000 712e7bf2 00000000 856a76c0 847696c0 20000200 40946400 00000003 1e40: dfb01f14 dfb01e50 8142e498 8142d0ac 00000000 712e7bf2 00000000 00000000 1e60: 824b957c dfb01ea4 0000005f 84538250 00000064 847696f0 dfb01ee4 dfb01e88 1e80: 807d0908 807c6ce0 00000064 00000001 00000000 dfb01ea4 862f53d0 834f5a18 1ea0: 00006400 0000000b dfb01e98 00000000 00000000 712e7bf2 00000000 856a76c0 1ec0: 40946400 20000200 20000200 856a76c0 00000003 83f98c40 dfb01ef4 dfb01ee8 1ee0: 807d0a38 712e7bf2 dfb01f14 00000000 856a76c1 40946400 20000200 856a76c0 1f00: 00000003 83f98c40 dfb01fa4 dfb01f18 805912c0 8142e150 ecac8b10 83f98c40 1f20: dfb01f3c dfb01f30 81ae7d94 81ae7c60 dfb01f54 dfb01f40 8025a894 8028c408 1f40: dfb01fb0 40000000 dfb01f84 dfb01f58 80220bf8 8025a850 00000000 8281d2fc 1f60: dfb01fb0 0013e4a0 ecac8b10 80220b4c 00000000 712e7bf2 dfb01fac 00000000 1f80: 00000000 00346310 00000036 8020029c 83f98c40 00000036 00000000 dfb01fa8 1fa0: 80200060 80591088 00000000 00000000 00000003 40946400 20000200 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc50dc 1fe0: 76fc4e88 76fc4e78 00018bc4 00130300 60000010 00000003 00000000 00000000 Call trace: [<81442d80>] (subdev_8255_io) from [<81442abc>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:847696c0 r5:00004f27 r4:81442d80 [<81442a64>] (subdev_8255_do_config) from [<81442e74>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81442a64>] (subdev_8255_do_config) from [<81442e74>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:833be000 [<81442dec>] (subdev_8255_io_init) from [<81443024>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81442dec>] (subdev_8255_io_init) from [<81443024>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:833be000 r5:00000000 r4:847696c0 [<81442fb0>] (dev_8255_attach) from [<81431968>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1077) r10:82b2f0bc r9:00000000 r8:847696c0 r7:dfb01d90 r6:00000000 r5:847696c0 r4:829d7360 [<8143185c>] (comedi_device_attach) from [<8142d174>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83f98c40 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:847696c0 r4:20000200 [<8142d0a0>] (do_devconfig_ioctl) from [<8142e498>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000200 r5:847696c0 r4:856a76c0 [<8142e144>] (comedi_unlocked_ioctl) from [<805912c0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142e144>] (comedi_unlocked_ioctl) from [<805912c0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142e144>] (comedi_unlocked_ioctl) from [<805912c0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142e144>] (comedi_unlocked_ioctl) from [<805912c0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83f98c40 r9:00000003 r8:856a76c0 r7:20000200 r6:40946400 r5:856a76c1 r4:00000000 [<8059107c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb01fa8 to 0xdfb01ff0) 1fa0: 00000000 00000000 00000003 40946400 20000200 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc50dc 1fe0: 76fc4e88 76fc4e78 00018bc4 00130300 r10:00000036 r9:83f98c40 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