8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=847e4003, *pmd=f4029003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 3840 Comm: syz.1.11447 Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at io_ring_buffers_peek+0x24/0x258 io_uring/kbuf.c:227 LR is at io_buffers_select+0x94/0xfc io_uring/kbuf.c:310 pc : [<8088956c>] lr : [<80889be0>] psr: 20000013 sp : dfb39db0 ip : dfb39df8 fp : dfb39df4 r10: f7eeffff r9 : 00000000 r8 : 8516fbc0 r7 : 00000000 r6 : 00004040 r5 : dfb39e44 r4 : 85f08000 r3 : 00000001 r2 : 85321b0c r1 : dfb39e44 r0 : 85f08000 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8503ba80 DAC: fffffffd Register r0 information: slab io_kiocb start 85f08000 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfb38000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 85321b00 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 85f08000 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfb38000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: slab kmalloc-64 start 8516fbc0 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfb38000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfb38000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.1.11447 (pid: 3840, stack limit = 0xdfb38000) Stack: (0xdfb39db0 to 0xdfb3a000) 9da0: 81a4be54 8030cb0c 85e16900 00000000 9dc0: 00000000 85321b0c 00000000 85f08000 8516fbc0 00004040 00000000 dfb39e44 9de0: 85e16800 f7eeffff dfb39e24 dfb39df8 80889be0 80889554 00000001 00000000 9e00: 85f08000 00004040 85321b00 80000001 00000000 f7eeffff dfb39e84 dfb39e28 9e20: 8089263c 80889b58 8089ec2c 000000e8 dfb39e5c dfb39e40 85321b0c 84ccec80 9e40: 85f08000 85321b0c 00000000 200440c0 00000001 f94e66e0 80886a40 85f08000 9e60: 81cf0c94 00000000 80000001 81cf0b5c 0000001a 84978c00 dfb39ebc dfb39e88 9e80: 80886bd8 80892328 85f08000 85d40000 85f08000 85e16800 85f0806c 85f08000 9ea0: 85d40000 00000000 00000000 84978c00 dfb39f14 dfb39ec0 808877a8 80886b7c 9ec0: 8088e164 81a4bdf8 00000000 00000000 00000001 00000001 81cf0b5c 00000001 9ee0: 85e16800 f94e66e0 849afe40 00000000 85e16800 000027e2 849afe40 00000000 9f00: 84978c00 00000000 dfb39fa4 dfb39f18 80888250 808875a8 ecac8b10 85e16840 9f20: 00000000 00000000 81a4fbd0 81a4faa0 dfb39f54 dfb39f40 8026b438 8029ce1c 9f40: dfb39fb0 40000000 dfb39f84 dfb39f58 802229dc 8026b3f4 00000000 8281d05c 9f60: dfb39fb0 0014c490 ecac8b10 80222930 00000000 f94e66e0 dfb39fac 00000000 9f80: 00000000 002e630c 000001aa 8020029c 84978c00 000001aa 00000000 dfb39fa8 9fa0: 80200060 80888124 00000000 00000000 00000003 000027e2 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bce0bc 9fe0: 76bcdec0 76bcdeb0 0001939c 00131f30 60000010 00000003 00000000 00000000 Call trace: [<80889548>] (io_ring_buffers_peek) from [<80889be0>] (io_buffers_select+0x94/0xfc io_uring/kbuf.c:310) r10:f7eeffff r9:85e16800 r8:dfb39e44 r7:00000000 r6:00004040 r5:8516fbc0 r4:85f08000 [<80889b4c>] (io_buffers_select) from [<8089263c>] (io_send_select_buffer io_uring/net.c:587 [inline]) [<80889b4c>] (io_buffers_select) from [<8089263c>] (io_send+0x320/0x490 io_uring/net.c:635) r10:f7eeffff r9:00000000 r8:80000001 r7:85321b00 r6:00004040 r5:85f08000 r4:00000000 r3:00000001 [<8089231c>] (io_send) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline]) [<8089231c>] (io_send) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759) r10:84978c00 r9:0000001a r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0c94 r4:85f08000 [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_queue_sqe io_uring/io_uring.c:1975 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqe io_uring/io_uring.c:2231 [inline]) [<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2348) r10:84978c00 r9:00000000 r8:00000000 r7:85d40000 r6:85f08000 r5:85f0806c r4:85e16800 [<8088759c>] (io_submit_sqes) from [<80888250>] (__do_sys_io_uring_enter io_uring/io_uring.c:3408 [inline]) [<8088759c>] (io_submit_sqes) from [<80888250>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3342) r10:00000000 r9:84978c00 r8:00000000 r7:849afe40 r6:000027e2 r5:85e16800 r4:00000000 [<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb39fa8 to 0xdfb39ff0) 9fa0: 00000000 00000000 00000003 000027e2 00000000 00000000 9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bce0bc 9fe0: 76bcdec0 76bcdeb0 0001939c 00131f30 r10:000001aa r9:84978c00 r8:8020029c r7:000001aa r6:002e630c r5:00000000 r4:00000000 Code: e1a08002 e5912000 e50b2030 e1a05001 (e1d920be) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e1a08002 mov r8, r2 4: e5912000 ldr r2, [r1] 8: e50b2030 str r2, [fp, #-48] @ 0xffffffd0 c: e1a05001 mov r5, r1 * 10: e1d920be ldrh r2, [r9, #14] <-- trapping instruction