8<--- cut here --- Unable to handle kernel paging request at virtual address 5bd3b000 [5bd3b000] *pgd=80000080005003, *pmd=00000000 Internal error: Oops: 206 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 9719 Comm: kworker/1:0 Not tainted 6.1.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express Workqueue: events free_ipc PC is at percpu_counter_add_batch+0x38/0x108 lib/percpu_counter.c:87 LR is at __this_cpu_preempt_check+0x1c/0x20 lib/smp_processor_id.c:66 pc : [<808101f4>] lr : [<81756544>] psr: 20000013 sp : ee65de28 ip : ee65de18 fp : ee65de4c r10: 8502ccc0 r9 : 00000001 r8 : 8502cd2c r7 : 7fffffff r6 : 00000000 r5 : 83ab3de8 r4 : 00000000 r3 : 5bd3b000 r2 : 00000000 r1 : 00000000 r0 : 00000001 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 842739c0 DAC: 00000000 Register r0 information: non-paged memory Register r1 information: NULL pointer Register r2 information: NULL pointer Register r3 information: non-paged memory Register r4 information: NULL pointer Register r5 information: slab kmalloc-cg-1k start 83ab3c00 pointer offset 488 size 1024 Register r6 information: NULL pointer Register r7 information: non-paged memory Register r8 information: slab kmalloc-cg-192 start 8502ccc0 pointer offset 108 size 192 Register r9 information: non-paged memory Register r10 information: slab kmalloc-cg-192 start 8502ccc0 pointer offset 0 size 192 Register r11 information: 2-page vmalloc region starting at 0xee65c000 allocated at kernel_clone+0x9c/0x3f4 kernel/fork.c:2671 Register r12 information: 2-page vmalloc region starting at 0xee65c000 allocated at kernel_clone+0x9c/0x3f4 kernel/fork.c:2671 Process kworker/1:0 (pid: 9719, stack limit = 0xee65c000) Stack: (0xee65de28 to 0xee65e000) de20: 00000000 8502cd2c 8502ccc0 83ab3c00 8502cd2c 00000001 de40: ee65de94 ee65de50 80663850 808101c8 7fffffff 00000004 00000001 00000001 de60: ee65de5c 042def9a 80663748 00000001 83ab3cb8 00000030 83ab3c00 80663748 de80: 00000001 8502ccc0 ee65decc ee65de98 8066ece8 80663754 ee65debc 83ab3ca0 dea0: 80810148 83ab3c00 00000000 ddde5a40 ddde9200 00000090 83e85080 ddde9215 dec0: ee65dee4 ee65ded0 80664d28 8066ec80 83ab3c00 00000000 ee65defc ee65dee8 dee0: 8066e814 80664d00 8232cd6c 89aeda00 ee65df44 ee65df00 802611c0 8066e79c df00: 80275518 802a0f18 ee65df2c ee65df18 80262ea4 00000000 ddde5a40 89aeda00 df20: ddde5a40 89aeda18 ddde5a5c 82204d40 00000008 ddde5a40 ee65df84 ee65df48 df40: 802615cc 80260fc0 ee65df64 81cffdc0 823d7b0e 83e85080 ee65df84 853df800 df60: 83e85080 80261560 89aeda00 899b0b40 ee909e8c 00000000 ee65dfac ee65df88 df80: 80269b24 8026156c 853df800 80269a38 00000000 00000000 00000000 00000000 dfa0: 00000000 ee65dfb0 80200100 80269a44 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000 Backtrace: [<808101bc>] (percpu_counter_add_batch) from [<80663850>] (percpu_counter_add_local include/linux/percpu_counter.h:75 [inline]) [<808101bc>] (percpu_counter_add_batch) from [<80663850>] (percpu_counter_sub_local include/linux/percpu_counter.h:225 [inline]) [<808101bc>] (percpu_counter_add_batch) from [<80663850>] (freeque+0x108/0x16c ipc/msg.c:292) r9:00000001 r8:8502cd2c r7:83ab3c00 r6:8502ccc0 r5:8502cd2c r4:00000000 [<80663748>] (freeque) from [<8066ece8>] (free_ipcs+0x74/0x90 ipc/namespace.c:125) r10:8502ccc0 r9:00000001 r8:80663748 r7:83ab3c00 r6:00000030 r5:83ab3cb8 r4:00000001 [<8066ec74>] (free_ipcs) from [<80664d28>] (msg_exit_ns+0x34/0x48 ipc/msg.c:1334) r10:ddde9215 r9:83e85080 r8:00000090 r7:ddde9200 r6:ddde5a40 r5:00000000 r4:83ab3c00 [<80664cf4>] (msg_exit_ns) from [<8066e814>] (free_ipc_ns ipc/namespace.c:138 [inline]) [<80664cf4>] (msg_exit_ns) from [<8066e814>] (free_ipc+0x84/0xfc ipc/namespace.c:157) r5:00000000 r4:83ab3c00 [<8066e790>] (free_ipc) from [<802611c0>] (process_one_work+0x20c/0x5ac kernel/workqueue.c:2289) r5:89aeda00 r4:8232cd6c [<80260fb4>] (process_one_work) from [<802615cc>] (worker_thread+0x6c/0x4e0 kernel/workqueue.c:2436) r10:ddde5a40 r9:00000008 r8:82204d40 r7:ddde5a5c r6:89aeda18 r5:ddde5a40 r4:89aeda00 [<80261560>] (worker_thread) from [<80269b24>] (kthread+0xec/0x11c kernel/kthread.c:376) r10:00000000 r9:ee909e8c r8:899b0b40 r7:89aeda00 r6:80261560 r5:83e85080 r4:853df800 [<80269a38>] (kthread) from [<80200100>] (ret_from_fork+0x14/0x34 arch/arm/kernel/entry-common.S:148) Exception stack(0xee65dfb0 to 0xee65dff8) dfa0: 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80269a38 r4:853df800 Code: e34801ec eb3d18ce e5951018 ee1d3f90 (e7918003) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e34801ec movt r0, #33260 ; 0x81ec 4: eb3d18ce bl 0xf46344 8: e5951018 ldr r1, [r5, #24] c: ee1d3f90 mrc 15, 0, r3, cr13, cr0, {4} * 10: e7918003 ldr r8, [r1, r3] <-- trapping instruction