syzbot

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BUG: KCSAN: data-race in can_send / can_send

read-write to 0xffff888135b379f0 of 8 bytes by interrupt on cpu 0:
 can_send+0x572/0x5d0 net/can/af_can.c:290
 bcm_can_tx+0x314/0x410 net/can/bcm.c:302
 bcm_tx_timeout_handler+0xdb/0x260
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x217/0x700 kernel/time/hrtimer.c:1752
 hrtimer_run_softirq+0xd6/0x120 kernel/time/hrtimer.c:1769
 __do_softirq+0xc1/0x265 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0x3b/0x90 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x6d/0x80 arch/x86/kernel/apic/apic.c:1074
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
 is_atomic kernel/kcsan/core.c:249 [inline]
 should_watch kernel/kcsan/core.c:277 [inline]
 check_access kernel/kcsan/core.c:752 [inline]
 __tsan_unaligned_write8+0x12d/0x180 kernel/kcsan/core.c:1025
 mas_empty_area_rev+0x40a/0xf50 lib/maple_tree.c:5057
 unmapped_area_topdown mm/mmap.c:1612 [inline]
 vm_unmapped_area+0x267/0x6c0 mm/mmap.c:1651
 arch_get_unmapped_area_topdown+0x3f0/0x470 arch/x86/kernel/sys_x86_64.c:219
 get_unmapped_area+0x15d/0x280 mm/mmap.c:1809
 do_mmap+0x297/0xa90 mm/mmap.c:1230
 vm_mmap_pgoff+0x12e/0x240 mm/util.c:546
 ksys_mmap_pgoff+0xc5/0x330 mm/mmap.c:1400
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read-write to 0xffff888135b379f0 of 8 bytes by interrupt on cpu 1:
 can_send+0x572/0x5d0 net/can/af_can.c:290
 bcm_can_tx+0x314/0x410 net/can/bcm.c:302
 bcm_tx_timeout_handler+0xdb/0x260
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x217/0x700 kernel/time/hrtimer.c:1752
 hrtimer_run_softirq+0xd6/0x120 kernel/time/hrtimer.c:1769
 __do_softirq+0xc1/0x265 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0x3b/0x90 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x36/0x80 arch/x86/kernel/apic/apic.c:1074
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645

value changed: 0x0000000000000cb7 -> 0x0000000000000cb8

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22431 Comm: syz-executor.1 Not tainted 6.6.0-rc1-syzkaller-00236-gad8a69f361b9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
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